i can't clean, autoremove or purge?

randy@randy-N751JK:~$ sudo apt-get --purge
[sudo] password for randy:
E: Command line option --purge is not understood in combination with the other options
randy@randy-N751JK:~$ sudo apt-get --purge
E: Command line option --purge is not understood in combination with the other options
randy@randy-N751JK:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt-get clean
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt-get autoremove --purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt autoremove --purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo purge-old-kernels
sudo: purge-old-kernels: command not found
randy@randy-N751JK:~$ sudo dpkg-reconfigure -plow unattended-upgrades
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
randy@randy-N751JK:~$ sudo dpkg-reconfigure -plow unattended-upgrades
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
randy@randy-N751JK:~$ sudo apt-get autoremove
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ Unattended-Upgrade::Remove-New-Unused-Dependencies "false"Unattended-Upgrade::Remove-New-Unused-Dependencies: command not found
randy@randy-N751JK:~$ Unattended-Upgrade::Remove-Unused-Dependencies "true";
Unattended-Upgrade::Remove-Unused-Dependencies: command not found
randy@randy-N751JK:~$ $ sudo rm -rv ${TMPDIR:-/var/tmp}/mkinitramfs-*
$: command not found
randy@randy-N751JK:~$ ## In Ubuntu 16.04 and earlier there may be leftover temporary
randy@randy-N751JK:~$ ## files to delete.
randy@randy-N751JK:~$ ## See: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=814345
randy@randy-N751JK:~$
randy@randy-N751JK:~$ $ uname -r ## This command identifies the currently-running kernel
$: command not found
randy@randy-N751JK:~$ 4.2.0-21-generic ## This is the current kernel.
4.2.0-21-generic: command not found
randy@randy-N751JK:~$ ## DO NOT REMOVE it!
randy@randy-N751JK:~$
randy@randy-N751JK:~$ $ dpkg -l | tail -n +6 | grep -E 'linux-image-[0-9]+' | grep -Fv $(uname -r)
$: command not found
randy@randy-N751JK:~$ ## This command lists all the kernels excluding the booted
randy@randy-N751JK:~$ ## kernel in the package database, and their status.
randy@randy-N751JK:~$ rc linux-image-4.2.0-14-generic ## The oldest kernel in the database
The program 'rc' is currently not installed. You can install it by typing:
sudo apt install rc
randy@randy-N751JK:~$ ## Status 'rc' means it's already been removed
randy@randy-N751JK:~$ ii linux-image-4.2.0-15-generic ## The oldest installed kernel. Eligible for removal.
The program 'ii' is currently not installed. You can install it by typing:
sudo apt install ii
randy@randy-N751JK:~$ ## Status 'ii' means Installed.
randy@randy-N751JK:~$ ii linux-image-4.2.0-16-generic ## Another old installed kernel. Eligible for removal
The program 'ii' is currently not installed. You can install it by typing:
sudo apt install ii
randy@randy-N751JK:~$ ii linux-image-4.2.0-18-generic ## Another old installed kernel. Eligible for removal
The program 'ii' is currently not installed. You can install it by typing:
sudo apt install ii
randy@randy-N751JK:~$ ii linux-image-4.2.0-19-generic ## The previous good kernel. Keep
The program 'ii' is currently not installed. You can install it by typing:
sudo apt install ii
randy@randy-N751JK:~$ iU linux-image-4.2.0-22-generic ## DO NOT REMOVE. Status 'iU' means it's not installed,
iU: command not found
randy@randy-N751JK:~$ ## but queued for install in apt.
randy@randy-N751JK:~$ ## This is the package we want apt to install.
randy@randy-N751JK:~$
randy@randy-N751JK:~$ ## Purge the oldest kernel package using dpkg instead of apt.
randy@randy-N751JK:~$ ## First you need to remove the image initrd.img file manually
randy@randy-N751JK:~$ ## due to Bug #1678187.
randy@randy-N751JK:~$ sudo update-initramfs -d -k 4.2.0-15-generic
update-initramfs: Deleting /boot/initrd.img-4.2.0-15-generic
randy@randy-N751JK:~$ sudo update-initramfs -d -k 4.2.0-15-generic
update-initramfs: Deleting /boot/initrd.img-4.2.0-15-generic
randy@randy-N751JK:~$ sudo dpkg --purge linux-image-4.2.0-15-generic linux-image-extra-4.2.0-15-generic
dpkg: warning: ignoring request to remove linux-image-4.2.0-15-generic which isn't installed
dpkg: warning: ignoring request to remove linux-image-extra-4.2.0-15-generic which isn't installed
randy@randy-N751JK:~$ sudo dpkg --purge linux-headers-4.2.0-15-generic
dpkg: warning: ignoring request to remove linux-headers-4.2.0-15-generic which isn't installed
randy@randy-N751JK:~$ ## Try also purging the common header package.
randy@randy-N751JK:~$ sudo dpkg --purge linux-headers-4.2.0-15
dpkg: warning: ignoring request to remove linux-headers-4.2.0-15 which isn't installed
randy@randy-N751JK:~$ sudo apt-get update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Reading package lists... Done
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt-get clean hello
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt-get autoremove --purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo purge-old-kernels
sudo: purge-old-kernels: command not found
randy@randy-N751JK:~$ sudo dpkg-reconfigure -plow unattended-upgrades
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
randy@randy-N751JK:~$ sudo apt-get clean
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo rm -rv ${TMPDIR:-/var/tmp}/mkinitramfs-*
removed '/var/tmp/mkinitramfs-FW_0TPIdt'
removed '/var/tmp/mkinitramfs-OL_LmLRie'
randy@randy-N751JK:~$ dpkg -l | tail -n +6 | grep -E 'linux-image-[0-9]+' | grep -Fv $(uname -r)
ii linux-image-3.13.0-108-generic 3.13.0-108.155 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
ii linux-image-3.13.0-24-generic 3.13.0-24.47 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP
ii linux-image-4.4.0-72-generic 4.4.0-72.93 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP
randy@randy-N751JK:~$ sudo apt autoremove --purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo purge-old-kernels
sudo: purge-old-kernels: command not found
randy@randy-N751JK:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$ sudo apt-get remove 50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.
Reading package lists... Done
Building dependency tree
Reading state information... Done
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
E: Unable to locate package 50unattended-upgrades.ucf-old in directory /etc/apt
E: Couldn't find any package by glob '50unattended-upgrades.ucf-old in directory /etc/apt'
E: Couldn't find any package by regex '50unattended-upgrades.ucf-old in directory /etc/apt'
randy@randy-N751JK:~$ sudo apt-get install 50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.
Reading package lists... Done
Building dependency tree
Reading state information... Done
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
E: Unable to locate package 50unattended-upgrades.ucf-old in directory /etc/apt
E: Couldn't find any package by glob '50unattended-upgrades.ucf-old in directory /etc/apt'
E: Couldn't find any package by regex '50unattended-upgrades.ucf-old in directory /etc/apt'
randy@randy-N751JK:~$ sudo apt-get autoremove --purge
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
N: Ignoring file '50unattended-upgrades.ucf-old' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension
randy@randy-N751JK:~$