no wifi after upgrade

[ 31.153634] b43-phy0 ERROR: Firmware file "b43/ucode5.fw" not found
[ 31.153736] b43-phy0 ERROR: Firmware file "b43-open/ucode5.fw" not found

Try

sudo apt-get install firmware-b43-installer

Or upgrade again. 14.04 isn't supported anymore. You are way behind on Ubuntu versions.

a@a-Latitude-D420:~$ sudo apt-get update; sudo apt-get install usbutils pciutils hwinfo grep rfkill; sudo lshw -C network; rfkill list; sudo iwlist scan | grep -Ei 'chan|ssid'; cat /etc/network/interfaces; cat /etc/lsb-release; lspci -nnk | grep -iA2 net; lsusb; nmcli g; sudo lshw -short; uname -a; sudo updatedb; dmesg | grep -E '02:00|80211|acx|at76|ath|b43|bcm|brcm|CX|eth|ipw|ireless|irmware|isl|lbtf|orinoco|ndiswrapper|NPE|ound|p54|prism|rror|rtl|RTL|rt2|RT2|rt3|RT3|rt5|RT5|rt6|RT6|rt7|RT7|usb|witch|wl';sudo dmidecode|grep -E 'anufact|roduct|erial|elease'; iwconfig; grep -E '80211|acx|at76|ath|b43|bcm|brcm|CX|eth|ipw|irmware|isl|lbtf|orinoco|ndiswrapper|NPE|p54|prism|rtl|rt2|rt3|rt6|rt7|wmi|witch|wl' /etc/modprobe.d/*; cat /var/lib/NetworkManager/NetworkManager.state; sudo hwinfo --netcard ; ps -aux|grep -E 'wpa|icd|etwork'; netstat -rn ; cat /etc/resolv.conf; ls -lia /boot; grep tmpfs /etc/fstab; ubuntu-support-status; sudo update-pciids; sudo update-usbids; sudo lsmod
[sudo] password for a:
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Ign:3 http://archive.canonical.com/ubuntu precise InRelease
Get:4 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Hit:5 http://archive.canonical.com/ubuntu precise Release
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu xenial-proposed InRelease [260 kB]
Hit:9 https://esm.ubuntu.com/ubuntu trusty-infra-security InRelease
Hit:10 https://esm.ubuntu.com/ubuntu trusty-infra-updates InRelease
Fetched 586 kB in 2s (227 kB/s)
Reading package lists... Done
W: http://archive.canonical.com/ubuntu/dists/precise/Release.gpg: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1)
Reading package lists... Done
Building dependency tree
Reading state information... Done
usbutils is already the newest version (1:007-4).
usbutils set to manually installed.
grep is already the newest version (2.25-1~16.04.1).
pciutils is already the newest version (1:3.3.1-1.1ubuntu1.3).
pciutils set to manually installed.
rfkill is already the newest version (0.5-1ubuntu3.1).
The following additional packages will be installed:
  libhd21 libx86emu1
The following NEW packages will be installed:
  hwinfo libhd21 libx86emu1
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 749 kB of archives.
After this operation, 3,191 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://us.archive.ubuntu.com/ubuntu xenial/universe i386 libx86emu1 i386 1.5-1 [50.2 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu xenial/universe i386 libhd21 i386 21.23-1 [682 kB]
Get:3 http://us.archive.ubuntu.com/ubuntu xenial/universe i386 hwinfo i386 21.23-1 [17.5 kB]
Fetched 749 kB in 1s (678 kB/s)
Selecting previously unselected package libx86emu1:i386.
(Reading database ... 197352 files and directories currently installed.)
Preparing to unpack .../libx86emu1_1.5-1_i386.deb ...
Unpacking libx86emu1:i386 (1.5-1) ...
Selecting previously unselected package libhd21:i386.
Preparing to unpack .../libhd21_21.23-1_i386.deb ...
Unpacking libhd21:i386 (21.23-1) ...
Selecting previously unselected package hwinfo.
Preparing to unpack .../hwinfo_21.23-1_i386.deb ...
Unpacking hwinfo (21.23-1) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up libx86emu1:i386 (1.5-1) ...
Setting up libhd21:i386 (21.23-1) ...
Setting up hwinfo (21.23-1) ...
Processing triggers for libc-bin (2.23-0ubuntu11) ...
  *-network
       description: Network controller
       product: BCM4311 802.11a/b/g
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:0c:00.0
       version: 01
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=b43-pci-bridge latency=0
       resources: irq:17 memory:efdfc000-efdfffff
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5752 Gigabit Ethernet PCI Express
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:09:00.0
       logical name: eth0
       version: 02
       serial: 00:18:8b:cf:0e:68
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 duplex=full firmware=5752-v3.19 ip=192.168.1.129 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:28 memory:efcf0000-efcfffff
0: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no
1: dell-wifi: Wireless LAN
 Soft blocked: no
 Hard blocked: no
2: dell-bluetooth: Bluetooth
 Soft blocked: no
 Hard blocked: no
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

auto lo
iface lo inet loopback

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.6 LTS"
09:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM5752 Gigabit Ethernet PCI Express [14e4:1600] (rev 02)
 Subsystem: Dell NetXtreme BCM5752 Gigabit Ethernet PCI Express [1028:01d6]
 Kernel driver in use: tg3
 Kernel modules: tg3
0c:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4311 802.11a/b/g [14e4:4312] (rev 01)
 Subsystem: Dell Wireless 1490 Dual Band WLAN Mini-Card [1028:0007]
 Kernel driver in use: b43-pci-bridge
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 004: ID 413c:8103 Dell Computer Corp. Wireless 350 Bluetooth
Bus 002 Device 005: ID 0b97:7762 O2 Micro, Inc. Oz776 SmartCard Reader
Bus 002 Device 003: ID 0b97:7761 O2 Micro, Inc. Oz776 1.1 Hub
Bus 002 Device 002: ID 413c:a005 Dell Computer Corp. Internal 2.0 Hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
STATE CONNECTIVITY WIFI-HW WIFI WWAN-HW WWAN
connected full enabled enabled enabled enabled
H/W path Device Class Description
========================================================
                              system Latitude D420
/0 bus 0TJ984
/0/0 memory 64KiB BIOS
/0/400 processor Intel(R) Core(TM) Duo CPU U250
/0/400/700 memory 32KiB L1 cache
/0/400/701 memory 2MiB L2 cache
/0/400/1.1 processor Logical CPU
/0/400/1.2 processor Logical CPU
/0/1000 memory 2560MiB System Memory
/0/1000/0 memory 512MiB Chip DDR Synchronous 533 MHz
/0/1000/1 memory 2GiB DIMM DDR Synchronous 667 MHz (
/0/100 bridge Mobile 945GM/PM/GMS, 943/940GML and
/0/100/2 display Mobile 945GM/GMS, 943/940GML Expres
/0/100/2.1 display Mobile 945GM/GMS/GME, 943/940GML Ex
/0/100/1b multimedia NM10/ICH7 Family High Definition Au
/0/100/1c bridge NM10/ICH7 Family PCI Express Port 1
/0/100/1c.1 bridge NM10/ICH7 Family PCI Express Port 2
/0/100/1c.1/0 network BCM4311 802.11a/b/g
/0/100/1c.2 bridge NM10/ICH7 Family PCI Express Port 3
/0/100/1c.2/0 eth0 network NetXtreme BCM5752 Gigabit Ethernet
/0/100/1d bus NM10/ICH7 Family USB UHCI Controlle
/0/100/1d/1 usb2 bus UHCI Host Controller
/0/100/1d/1/2 bus Internal 2.0 Hub
/0/100/1d/1/2/3 bus Oz776 1.1 Hub
/0/100/1d/1/2/3/2 generic O2Micro CCID SC Reader
/0/100/1d/1/2/4 communication Wireless 350 Bluetooth
/0/100/1d.1 bus NM10/ICH7 Family USB UHCI Controlle
/0/100/1d.1/1 usb3 bus UHCI Host Controller
/0/100/1d.2 bus NM10/ICH7 Family USB UHCI Controlle
/0/100/1d.2/1 usb4 bus UHCI Host Controller
/0/100/1d.2/1/1 input USB Receiver
/0/100/1d.3 bus NM10/ICH7 Family USB UHCI Controlle
/0/100/1d.3/1 usb5 bus UHCI Host Controller
/0/100/1d.7 bus NM10/ICH7 Family USB2 EHCI Controll
/0/100/1d.7/1 usb1 bus EHCI Host Controller
/0/100/1e bridge 82801 Mobile PCI Bridge
/0/100/1e/1 bridge RL5c476 II
/0/100/1e/1.1 bus R5C552 IEEE 1394 Controller
/0/100/1e/1.2 generic R5C822 SD/SDIO/MMC/MS/MSPro Host Ad
/0/100/1f bridge 82801GBM (ICH7-M) LPC Interface Bri
/0/100/1f.1 storage 82801G (ICH7 Family) IDE Controller
/0/100/1f.3 bus NM10/ICH7 Family SMBus Controller
/0/1 scsi0 storage
/0/1/0.0.0 /dev/sda disk 80GB TOSHIBA MK8009GA
/0/1/0.0.0/1 /dev/sda1 volume 72GiB EXT4 volume
/0/1/0.0.0/2 /dev/sda2 volume 2037MiB Extended partition
/0/1/0.0.0/2/5 /dev/sda5 volume 2037MiB Linux swap / Solaris partit
/1 power DELL NX6267C
Linux a-Latitude-D420 4.4.0-180-generic #210-Ubuntu SMP Fri May 15 17:04:23 UTC 2020 i686 i686 i686 GNU/Linux
[ 0.000000] Found optimal setting for mtrr clean up
[ 0.016405] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
[ 0.284019] PCCT header not found.
[ 0.420902] acpi PNP0A03:00: [Firmware Info]: MMCONFIG for domain 0000 [bus 00-3f] only partially covers this bridge
[ 0.480163] usbcore: registered new interface driver usbfs
[ 0.480198] usbcore: registered new interface driver hub
[ 0.480237] usbcore: registered new device driver usb
[ 0.485016] clocksource: Switched to clocksource hpet
[ 0.548133] pnp: PnP ACPI: found 9 devices
[ 2.176093] Console: switching to colour frame buffer device 128x48
[ 2.177195] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input0
[ 2.177874] ACPI: Lid Switch [LID]
[ 2.252195] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 2.252202] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.252208] usb usb1: Product: EHCI Host Controller
[ 2.252214] usb usb1: Manufacturer: Linux 4.4.0-180-generic ehci_hcd
[ 2.252219] usb usb1: SerialNumber: 0000:00:1d.7
[ 2.252562] hub 1-0:1.0: USB hub found
[ 2.253857] usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.253863] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.253869] usb usb2: Product: UHCI Host Controller
[ 2.253875] usb usb2: Manufacturer: Linux 4.4.0-180-generic uhci_hcd
[ 2.253880] usb usb2: SerialNumber: 0000:00:1d.0
[ 2.254196] hub 2-0:1.0: USB hub found
[ 2.254997] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.255003] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.255009] usb usb3: Product: UHCI Host Controller
[ 2.255015] usb usb3: Manufacturer: Linux 4.4.0-180-generic uhci_hcd
[ 2.255020] usb usb3: SerialNumber: 0000:00:1d.1
[ 2.255338] hub 3-0:1.0: USB hub found
[ 2.256183] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.256190] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.256195] usb usb4: Product: UHCI Host Controller
[ 2.256201] usb usb4: Manufacturer: Linux 4.4.0-180-generic uhci_hcd
[ 2.256207] usb usb4: SerialNumber: 0000:00:1d.2
[ 2.256527] hub 4-0:1.0: USB hub found
[ 2.257321] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001
[ 2.257328] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.257334] usb usb5: Product: UHCI Host Controller
[ 2.257339] usb usb5: Manufacturer: Linux 4.4.0-180-generic uhci_hcd
[ 2.257345] usb usb5: SerialNumber: 0000:00:1d.3
[ 2.257677] hub 5-0:1.0: USB hub found
[ 2.288268] ima: No TPM chip found, activating TPM-bypass!
[ 2.290389] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 2.516450] isapnp: No Plug & Play device found
[ 2.763474] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work.
[ 2.856084] ssb: Found chip with id 0x4311, rev 0x01 and package 0x00
[ 2.856103] ssb: Core 0 found: ChipCommon (cc 0x800, rev 0x11, vendor 0x4243)
[ 2.856119] ssb: Core 1 found: IEEE 802.11 (cc 0x812, rev 0x0A, vendor 0x4243)
[ 2.856136] ssb: Core 2 found: USB 1.1 Host (cc 0x817, rev 0x03, vendor 0x4243)
[ 2.856152] ssb: Core 3 found: PCI-E (cc 0x820, rev 0x01, vendor 0x4243)
[ 2.900993] sdhci-pci 0000:02:01.2: SDHCI controller found [1180:0822] (rev 18)
[ 2.902230] sdhci-pci 0000:02:01.2: No vmmc regulator found
[ 2.902236] sdhci-pci 0000:02:01.2: No vqmmc regulator found
[ 2.924650] ssb: Sonics Silicon Backplane found on PCI device 0000:0c:00.0
[ 2.952132] usb 2-2: new full-speed USB device number 2 using uhci_hcd
[ 3.010231] tg3 0000:09:00.0 eth0: Tigon3 [partno(BCM5752KFBG) rev 6002] (PCI Express) MAC address 00:18:8b:cf:0e:68
[ 3.010243] tg3 0000:09:00.0 eth0: attached PHY is 5752 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[0])
[ 3.010250] tg3 0000:09:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[ 3.010256] tg3 0000:09:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[ 3.064627] fb: switching to inteldrmfb from VESA VGA
[ 3.064835] Console: switching to colour dummy device 80x25
[ 3.189575] usb 2-2: New USB device found, idVendor=413c, idProduct=a005
[ 3.189585] usb 2-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.193925] hub 2-2:1.0: USB hub found
[ 3.496101] usb 2-2.3: new full-speed USB device number 3 using uhci_hcd
[ 3.557145] Workqueue: events_unbound async_run_entry_fn
[ 3.557205] [<c1074ed7>] warn_slowpath_common+0x87/0xc0
[ 3.557382] [<c1074f4e>] warn_slowpath_fmt+0x3e/0x60
[ 3.557610] [<c17ef7ea>] ? __mutex_unlock_slowpath+0x5a/0x80
[ 3.566786] Console: switching to colour frame buffer device 160x50
[ 3.593185] [<c1074ed7>] warn_slowpath_common+0x87/0xc0
[ 3.593328] [<c1074f4e>] warn_slowpath_fmt+0x3e/0x60
[ 3.594175] [<c1074ed7>] warn_slowpath_common+0x87/0xc0
[ 3.594222] [<c1074fe2>] warn_slowpath_null+0x22/0x30
[ 3.620077] usb 4-1: new full-speed USB device number 2 using uhci_hcd
[ 3.630168] usb 2-2.3: New USB device found, idVendor=0b97, idProduct=7761
[ 3.630176] usb 2-2.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.633264] hub 2-2.3:1.0: USB hub found
[ 3.712143] usb 2-2.4: new full-speed USB device number 4 using uhci_hcd
[ 3.806134] usb 4-1: New USB device found, idVendor=046d, idProduct=c52b
[ 3.806153] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3.806159] usb 4-1: Product: USB Receiver
[ 3.806164] usb 4-1: Manufacturer: Logitech
[ 3.858700] usbcore: registered new interface driver usbhid
[ 3.858707] usbhid: USB HID core driver
[ 3.881164] usb 2-2.4: New USB device found, idVendor=413c, idProduct=8103
[ 3.881174] usb 2-2.4: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 3.882584] logitech-djreceiver 0003:046D:C52B.0003: hiddev0,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.2-1/input2
[ 3.920146] usb 2-2.3.2: new full-speed USB device number 5 using uhci_hcd
[ 4.019278] input: Logitech M325 as /devices/pci0000:00/0000:00:1d.2/usb4/4-1/4-1:1.2/0003:046D:C52B.0003/0003:046D:400A.0004/input/input7
[ 4.019568] logitech-hidpp-device 0003:046D:400A.0004: input,hidraw1: USB HID v1.11 Mouse [Logitech M325] on usb-0000:00:1d.2-1:1
[ 4.039156] usb 2-2.3.2: New USB device found, idVendor=0b97, idProduct=7762
[ 4.039166] usb 2-2.3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.039172] usb 2-2.3.2: Product: O2Micro CCID SC Reader
[ 4.039177] usb 2-2.3.2: Manufacturer: O2
[ 18.275047] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
[ 18.558773] lp: driver loaded but no devices found
[ 29.181836] usbcore: registered new interface driver btusb
[ 30.354669] leds_ss4200: no LED devices found
[ 30.580866] yenta_cardbus 0000:02:01.0: CardBus bridge found [1028:01d6]
[ 30.813285] b43-phy0: Broadcom 4311 WLAN found (core revision 10)
[ 30.845122] b43-phy0: Found PHY: Analog 4, Type 2 (G), Revision 8
[ 30.845148] b43-phy0: Found Radio: Manuf 0x17F, ID 0x2050, Revision 2, Version 0
[ 30.845154] b43-phy0 warning: 5 GHz band is unsupported on this PHY
[ 31.371139] input: HDA Intel Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
[ 31.371354] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[ 31.542663] b43 ssb0:0: Direct firmware load for b43/ucode5.fw failed with error -2
[ 31.542709] b43 ssb0:0: Direct firmware load for b43/ucode5.fw failed with error -2
[ 31.717479] b43 ssb0:0: Direct firmware load for b43-open/ucode5.fw failed with error -2
[ 31.717526] b43 ssb0:0: Direct firmware load for b43-open/ucode5.fw failed with error -2
[ 31.717535] b43-phy0 ERROR: Firmware file "b43/ucode5.fw" not found
[ 31.717541] b43-phy0 ERROR: Firmware file "b43-open/ucode5.fw" not found
[ 31.717547] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all instructions on this website.
[ 34.756714] cfg80211: World regulatory domain updated:
[ 34.756728] cfg80211: DFS Master region: unset
[ 34.756733] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 34.756740] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 34.756746] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz, 92000 KHz AUTO), (N/A, 2000 mBm), (N/A)
[ 34.756752] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
[ 34.756758] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A)
[ 34.756764] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s)
[ 34.756770] cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
[ 34.756775] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
[ 34.756780] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
[ 37.922662] audit: type=1400 audit(1590857114.128:12): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/mission-control-5" pid=546 comm="apparmor_parser"
[ 37.925434] audit: type=1400 audit(1590857114.132:13): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/telepathy-*" pid=546 comm="apparmor_parser"
[ 37.927625] audit: type=1400 audit(1590857114.132:14): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/telepathy-*//pxgsettings" pid=546 comm="apparmor_parser"
[ 37.929985] audit: type=1400 audit(1590857114.136:15): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/telepathy-*//sanitized_helper" pid=546 comm="apparmor_parser"
[ 37.931591] audit: type=1400 audit(1590857114.136:16): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/telepathy-ofono" pid=546 comm="apparmor_parser"
[ 39.750075] audit: type=1400 audit(1590857115.956:21): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/ippusbxd" pid=596 comm="apparmor_parser"
[ 59.344452] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 59.380620] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 79.441404] tg3 0000:09:00.0 eth0: Link is up at 100 Mbps, full duplex
[ 79.441414] tg3 0000:09:00.0 eth0: Flow control is off for TX and off for RX
[ 79.441445] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 2004.963149] usb 2-2.4: USB disconnect, device number 4
[ 2006.328074] usb 2-2.4: new full-speed USB device number 6 using uhci_hcd
[ 2006.494264] usb 2-2.4: New USB device found, idVendor=413c, idProduct=8103
[ 2006.494280] usb 2-2.4: New USB device strings: Mfr=0, Product=0, SerialNumber=0
 Release Date: 04/03/2007
  Serial services are supported (int 14h)
 Manufacturer: Dell Inc.
 Product Name: Latitude D420
 Serial Number: 4R62XC1
 Manufacturer: Dell Inc.
 Product Name: 0TJ984
 Serial Number: .4R62XC1.CN1296174O4162.
 Manufacturer: Dell Inc.
 Serial Number: 4R62XC1
 Manufacturer: Intel
 Serial Number: Not Specified
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Manufacturer: 2C00000000000000
 Serial Number: E625B1CE
 Manufacturer: Sanyo
 SBDS Serial Number: 033D
 SBDS Manufacture Date: 2007-12-21
lo no wireless extensions.

eth0 no wireless extensions.

/etc/modprobe.d/alsa-base.conf:install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; : ; }
/etc/modprobe.d/blacklist-ath_pci.conf:# which ath5k cannot recover. To prevent this condition, stop
/etc/modprobe.d/blacklist-ath_pci.conf:blacklist ath_pci
/etc/modprobe.d/blacklist.conf:blacklist eth1394
/etc/modprobe.d/blacklist.conf:# replaced by p54pci
/etc/modprobe.d/blacklist.conf:blacklist prism54
/etc/modprobe.d/blacklist.conf:# replaced by b43 and ssb.
/etc/modprobe.d/blacklist.conf:blacklist bcm43xx
/etc/modprobe.d/blacklist-oss.conf:blacklist uart6850
/etc/modprobe.d/blacklist-watchdog.conf:blacklist twl4030_wdt
/etc/modprobe.d/iwlwifi.conf:# /etc/modprobe.d/iwlwifi.conf
/etc/modprobe.d/iwlwifi.conf:# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
/etc/modprobe.d/iwlwifi.conf:# microcode file installed on the system. When removing iwlwifi, first
/etc/modprobe.d/iwlwifi.conf:# remove the iwl?vm module and then iwlwifi.
/etc/modprobe.d/iwlwifi.conf:remove iwlwifi \
/etc/modprobe.d/iwlwifi.conf:(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
/etc/modprobe.d/iwlwifi.conf:&& /sbin/modprobe -r mac80211
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
26: PCI 900.0: 0200 Ethernet controller
  [Created at pci.366]
  Unique ID: rBUF.TwqwK2KNLAA
  Parent ID: hoOk.+JlQ9c_tGt0
  SysFS ID: /devices/pci0000:00/0000:00:1c.2/0000:09:00.0
  SysFS BusID: 0000:09:00.0
  Hardware Class: network
  Model: "Broadcom NetXtreme BCM5752 Gigabit Ethernet PCI Express"
  Vendor: pci 0x14e4 "Broadcom"
  Device: pci 0x1600 "NetXtreme BCM5752 Gigabit Ethernet PCI Express"
  SubVendor: pci 0x1028 "Dell"
  SubDevice: pci 0x01d6
  Revision: 0x02
  Driver: "tg3"
  Driver Modules: "tg3"
  Device File: eth0
  Memory Range: 0xefcf0000-0xefcfffff (rw,non-prefetchable)
  IRQ: 28 (61075 events)
  HW Address: 00:18:8b:cf:0e:68
  Link detected: yes
  Module Alias: "pci:v000014E4d00001600sv00001028sd000001D6bc02sc00i00"
  Driver Info #0:
    Driver Status: tg3 is active
    Driver Activation Cmd: "modprobe tg3"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #13 (PCI bridge)

27: PCI c00.0: 0280 Network controller
  [Created at pci.366]
  Unique ID: zb5c.huWLObTszk3
  Parent ID: qTvu.zUswBTlTD60
  SysFS ID: /devices/pci0000:00/0000:00:1c.1/0000:0c:00.0
  SysFS BusID: 0000:0c:00.0
  Hardware Class: network
  Model: "Dell Wireless 1490 Dual Band WLAN Mini-Card"
  Vendor: pci 0x14e4 "Broadcom"
  Device: pci 0x4312 "BCM4311 802.11a/b/g"
  SubVendor: pci 0x1028 "Dell"
  SubDevice: pci 0x0007 "Wireless 1490 Dual Band WLAN Mini-Card"
  Revision: 0x01
  Driver: "b43-pci-bridge"
  Driver Modules: "ssb"
  Memory Range: 0xefdfc000-0xefdfffff (rw,non-prefetchable)
  IRQ: 17 (1 event)
  Module Alias: "pci:v000014E4d00004312sv00001028sd00000007bc02sc80i00"
  Driver Info #0:
    Driver Status: ssb is active
    Driver Activation Cmd: "modprobe ssb"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #12 (PCI bridge)
root 766 0.0 0.6 83308 14092 ? Ssl 09:45 0:00 /usr/sbin/NetworkManager --no-daemon
root 1070 0.0 0.1 6008 3128 ? S 09:45 0:00 /sbin/dhclient -d -q -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /var/run/dhclient-eth0.pid -lf /var/lib/NetworkManager/dhclient-f176a4a3-5b5b-3651-ae2d-fbd1754288a2-eth0.lease -cf /var/lib/NetworkManager/dhclient-eth0.conf eth0
nobody 1085 0.0 0.1 9116 3688 ? S 09:45 0:00 /usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/var/run/NetworkManager/dnsmasq.pid --listen-address=127.0.1.1 --cache-size=0 --conf-file=/dev/null --proxy-dnssec --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d
root 1258 0.0 0.1 6008 3148 ? S 09:46 0:00 /sbin/dhclient -d -q -6 -N -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /var/run/dhclient6-eth0.pid -lf /var/lib/NetworkManager/dhclient6-f176a4a3-5b5b-3651-ae2d-fbd1754288a2-eth0.lease -cf /var/lib/NetworkManager/dhclient6-eth0.conf eth0
a 4688 0.9 2.7 313316 55624 ? SLl 10:11 0:04 /usr/lib/chromium-browser/chromium-browser --type=utility --field-trial-handle=12039776368780378987,15744324417528952506,131072 --lang=en-US --service-sandbox-type=network --disable-webrtc-apm-in-audio-service --shared-files=v8_snapshot_data:100
a 6016 0.0 0.0 5104 796 pts/2 S+ 10:19 0:00 grep --color=auto -E wpa|icd|etwork
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.1.1
search attlocal.net
total 93008
786433 drwxr-xr-x 3 root root 4096 May 30 09:42 .
     2 drwxr-xr-x 23 root root 4096 May 30 09:25 ..
786653 -rw-r--r-- 1 root root 170242 May 9 2019 config-3.13.0-170-generic
786652 -rw-r--r-- 1 root root 194474 May 15 11:34 config-4.4.0-180-generic
786434 drwxr-xr-x 5 root root 12288 May 30 09:42 grub
786440 -rw-r--r-- 1 root root 34280689 May 30 09:35 initrd.img-3.13.0-170-generic
786436 -rw-r--r-- 1 root root 41257393 May 30 09:36 initrd.img-4.4.0-180-generic
786733 -rw-r--r-- 1 root root 182704 Jan 28 2016 memtest86+.bin
786734 -rw-r--r-- 1 root root 184380 Jan 28 2016 memtest86+.elf
786732 -rw-r--r-- 1 root root 184840 Jan 28 2016 memtest86+_multiboot.bin
786654 -rw------- 1 root root 2719467 May 9 2019 System.map-3.13.0-170-generic
786730 -rw------- 1 root root 3126811 May 15 11:34 System.map-4.4.0-180-generic
786655 -rw------- 1 root root 5920944 May 9 2019 vmlinuz-3.13.0-170-generic
786731 -rw------- 1 root root 6973472 May 15 11:34 vmlinuz-4.4.0-180-generic
Support status summary of 'a-Latitude-D420':

You have 1802 packages (91.4%) supported until April 2021 (Canonical - 5y)
You have 21 packages (1.1%) supported until April 2021 (Community - 5y)

You have 6 packages (0.3%) that can not/no-longer be downloaded
You have 142 packages (7.2%) that are unsupported

Run with --show-unsupported, --show-supported or --show-all to see more details
Downloaded daily snapshot dated 2020-05-29 03:15:02
--2020-05-30 10:19:36-- http://www.linux-usb.org/usb.ids
Resolving www.linux-usb.org (www.linux-usb.org)... 216.105.38.10
Connecting to www.linux-usb.org (www.linux-usb.org)|216.105.38.10|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 617921 (603K) [text/plain]
Saving to: ‘/var/lib/usbutils/usb.ids.new’

/var/lib/usbutils/u 100%[===================>] 603.44K 2.33MB/s in 0.3s

2020-05-30 10:19:37 (2.33 MB/s) - ‘/var/lib/usbutils/usb.ids.new’ saved [617921/617921]

Done.
Module Size Used by
rfcomm 65536 2
bnep 20480 2
coretemp 16384 0
dell_rbtn 16384 0
dell_wmi 16384 0
kvm 499712 0
sparse_keymap 16384 1 dell_wmi
gpio_ich 16384 0
dell_laptop 24576 0
irqbypass 16384 1 kvm
dcdbas 16384 1 dell_laptop
snd_hda_codec_hdmi 49152 1
dell_smm_hwmon 16384 0
snd_hda_codec_idt 53248 1
snd_hda_codec_generic 69632 1 snd_hda_codec_idt
pcmcia 57344 0
snd_hda_intel 36864 3
b43 405504 0
snd_hda_codec 118784 4 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_codec_generic,snd_hda_intel
snd_hda_core 65536 5 snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
yenta_socket 45056 0
joydev 20480 0
input_leds 16384 0
snd_hwdep 16384 1 snd_hda_codec
pcmcia_rsrc 20480 1 yenta_socket
serio_raw 16384 0
pcmcia_core 24576 3 pcmcia,pcmcia_rsrc,yenta_socket
bcma 49152 1 b43
lpc_ich 20480 0
mac80211 667648 1 b43
snd_pcm 98304 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_core
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
cfg80211 499712 2 b43,mac80211
snd_seq 57344 2 snd_seq_midi_event,snd_seq_midi
btusb 40960 0
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
btrtl 16384 1 btusb
ssb_hcd 16384 0
snd_timer 28672 2 snd_pcm,snd_seq
btbcm 16384 1 btusb
btintel 16384 1 btusb
bluetooth 466944 29 bnep,btbcm,btrtl,btusb,rfcomm,btintel
snd 69632 17 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
soundcore 16384 1 snd
ecdh_generic 28672 1 bluetooth
shpchp 32768 0
mac_hid 16384 0
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,ppdev,parport_pc
autofs4 40960 2
hid_logitech_hidpp 20480 0
hid_logitech_dj 20480 0
usbhid 53248 0
hid 98304 3 usbhid,hid_logitech_dj,hid_logitech_hidpp
i915 1163264 3
tg3 163840 0
firewire_ohci 36864 0
i2c_algo_bit 16384 1 i915
drm_kms_helper 139264 1 i915
psmouse 118784 0
syscopyarea 16384 1 drm_kms_helper
firewire_core 65536 1 firewire_ohci
sysfillrect 16384 1 drm_kms_helper
sdhci_pci 24576 0
ptp 20480 1 tg3
sysimgblt 16384 1 drm_kms_helper
sdhci 45056 1 sdhci_pci
pata_acpi 16384 0
crc_itu_t 16384 1 firewire_core
pps_core 20480 1 ptp
fb_sys_fops 16384 1 drm_kms_helper
ssb 57344 2 b43,ssb_hcd
drm 311296 5 i915,drm_kms_helper
wmi 20480 1 dell_wmi
video 40960 3 i915,dell_wmi,dell_laptop

I clicked on this link but it says its a bad link:

 http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware

From your output:

Hit:5 http://archive.canonical.com/ubuntu precise Release
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu xenial-proposed InRelease [260 kB]
Hit:9 https://esm.ubuntu.com/ubuntu trusty-infra-security InRelease
Hit:10 https://esm.ubuntu.com/ubuntu trusty-infra-updates InRelease

Your sources.list is a mess, you are mixing repositories for precise, trusty and xenial.

DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial

Everything that refers to precise or trusty has to be changed to xenial or removed.

you said, " Everything that refers to precise or trusty has to be changed to xenial or removed."

how would this be done?

What is the output of:

sudo egrep -R 'precise|trusty' /etc/apt/*

Thanks

a@a-Latitude-D420:~$ sudo egrep -R 'precise|trusty' /etc/apt/*
[sudo] password for a:
Sorry, try again.
[sudo] password for a:
/etc/apt/apt.conf.d/01autoremove-kernels:ii linux-image-generic-lts-trusty 3.13.0.170.181 i386 Generic Linux kernel image
/etc/apt/preferences.d/ubuntu-esm-infra-trusty:Pin: release o=UbuntuESM, n=trusty
/etc/apt/sources.list:# deb cdrom:[Ubuntu 12.04.5 LTS _Precise Pangolin_ - Release i386 (20140807.1)]/ precise main restricted
/etc/apt/sources.list:deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list:deb-src http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.save:deb https://esm.ubuntu.com/ubuntu trusty-infra-security main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.save:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-security main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.save:deb https://esm.ubuntu.com/ubuntu trusty-infra-updates main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.save:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-updates main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.distUpgrade:deb https://esm.ubuntu.com/ubuntu trusty-infra-security main
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.distUpgrade:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-security main
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.distUpgrade:deb https://esm.ubuntu.com/ubuntu trusty-infra-updates main
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.distUpgrade:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-updates main
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list:deb https://esm.ubuntu.com/ubuntu trusty-infra-security main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-security main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list:deb https://esm.ubuntu.com/ubuntu trusty-infra-updates main # disabled on upgrade to xenial
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list:deb-src https://esm.ubuntu.com/ubuntu trusty-infra-updates main # disabled on upgrade to xenial
/etc/apt/sources.list.distUpgrade:# deb cdrom:[Ubuntu 12.04.5 LTS _Precise Pangolin_ - Release i386 (20140807.1)]/ precise main restricted
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
/etc/apt/sources.list.distUpgrade:deb-src http://us.archive.ubuntu.com/ubuntu/ trusty restricted universe main multiverse #Added by software-properties
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
/etc/apt/sources.list.distUpgrade:deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates restricted universe main multiverse #Added by software-properties
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
/etc/apt/sources.list.distUpgrade:deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #Added by software-properties
/etc/apt/sources.list.distUpgrade:deb http://security.ubuntu.com/ubuntu trusty-security main restricted
/etc/apt/sources.list.distUpgrade:deb-src http://security.ubuntu.com/ubuntu trusty-security restricted universe main multiverse #Added by software-properties
/etc/apt/sources.list.distUpgrade:deb http://security.ubuntu.com/ubuntu trusty-security universe
/etc/apt/sources.list.distUpgrade:deb http://security.ubuntu.com/ubuntu trusty-security multiverse
/etc/apt/sources.list.distUpgrade:deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.distUpgrade:deb-src http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.distUpgrade:deb http://extras.ubuntu.com/ubuntu trusty main
/etc/apt/sources.list.distUpgrade:deb-src http://extras.ubuntu.com/ubuntu trusty main
/etc/apt/sources.list.distUpgrade:deb http://us.archive.ubuntu.com/ubuntu/ trusty-proposed restricted universe main multiverse
/etc/apt/sources.list.save:# deb cdrom:[Ubuntu 12.04.5 LTS _Precise Pangolin_ - Release i386 (20140807.1)]/ precise main restricted
/etc/apt/sources.list.save:deb http://archive.canonical.com/ubuntu precise partner
/etc/apt/sources.list.save:deb-src http://archive.canonical.com/ubuntu precise partner

1. Do some clean-up

sudo rm /etc/apt/sources.list.save
sudo rm /etc/apt/sources.list.distUpgrade
sudo rm /etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.save
sudo rm /etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list.distUpgrade

2. Change the sources.list

sudo gedit /etc/apt/sources.list
in the editor window that opens search for the lines

deb http://archive.canonical.com/ubuntu precise partner
deb-src http://archive.canonical.com/ubuntu precise partner

and change them into

deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner

3. What is the status of your ESM subscription (for trusty)?
If you are running xenial, then you do not need it, because xenial is within standard support for another year.

In my opinion the two files
/etc/apt/sources.list.d/ubuntu-esm-infra-trusty.list
/etc/apt/preferences.d/ubuntu-esm-infra-trusty
should be also removed.