disabled wireless connection

To be able to help you we need to know what kind of hardware you use. So please gather as much information as possible :)

To help you better we need some infos about your hardware so please open a Terminal from the menu Applications->Accessories->Terminal and type:

lspci

lspci is lower of LSPCI

copy and paste result here.

Thank you

 lspci
00:00.0 Host bridge: ATI Technologies Inc RS480 Host Bridge (rev 01)
00:01.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:05.0 PCI bridge: ATI Technologies Inc RS480 PCI Bridge
00:13.0 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
00:13.1 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
00:13.2 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller
00:14.0 SMBus: ATI Technologies Inc IXP SB400 SMBus Controller (rev 11)
00:14.1 IDE interface: ATI Technologies Inc IXP SB400 IDE Controller
00:14.3 ISA bridge: ATI Technologies Inc IXP SB400 PCI-ISA Bridge
00:14.4 PCI bridge: ATI Technologies Inc IXP SB400 PCI-PCI Bridge
00:14.5 Multimedia audio controller: ATI Technologies Inc IXP SB400 AC'97 Audio Controller (rev 02)
00:14.6 Modem: ATI Technologies Inc SB400 AC'97 Modem Controller (rev 02)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon XPRESS 200M 5955 (PCIE)
06:02.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
06:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

Could you also post the outputs of 'sudo lshw -C network' and 'iwconfig'.

Should drivers be the issue, i.e. not installed, you need the b43 driver. Check https://help.ubuntu.com/community/WifiDocs/Driver/b43

thanks for your help
abraham@abraham -laptop:~$ sudo lshw -C network
sudo: unable to resolve host abraham -laptop
abraham@abraham -laptop:~$ iwconfig
lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

eth1 IEEE 802.11g ESSID:""
          Mode:Managed Channel:0 Access Point: Not-Associated
          Tx-Power=0 dBm
          Retry min limit:7 RTS thr:off Fragment thr=2346 B
          Link Quality:0 Signal level:0 Noise level:0
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

'sudo: unable to resolve host abraham -laptop'
That in itsself is rather weird. I suppose it's cause of the space. Can you remove the space in your hostname?

Run 'iwlist scan' to scan for wireless networks.

Hi how does one run an iwlist scan?
I do not understand removing the space in my hostname?

abraham@abraham -laptop:~$ sudo:unable to resolve host abraham-laptop
bash: sudo:unable: command not found
abraham@abraham -laptop:~$

Run it like you ran 'iwconfig'. Enter 'iwlist scan' ina shell command prompt and hit Enter.

Further remove the space from your hostname via "System > Administration > Network > General Tab" or open 'gksu /etc/hosts /etc/hostname' and change it in both to the same.

Hello Johannes do you mean put iwconfig in a terminal?........... whats is a shell command prompt?

I tried this...lo no wireless extensions.

eth0 no wireless extensions.

wmaster0 no wireless extensions.

eth1 IEEE 802.11g ESSID:""
          Mode:Managed Channel:0 Access Point: Not-Associated
          Tx-Power=0 dBm
          Retry min limit:7 RTS thr:off Fragment thr=2346 B
          Link Quality:0 Signal level:0 Noise level:0
          Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
          Tx excessive retries:0 Invalid misc:0 Missed beacon:0

abraham@abraham -laptop:~$ iwlist scan
lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wmaster0 Interface doesn't support scanning.

eth1 No scan results

abraham@abraham -laptop:~$

 hello Johannes
I went to general tab and changed abraham-laptop to abraham laptop why I dont know.... it said something about changing it in both places???

Most likely you had already changed your hostname once and thus lost the ability to run as root.

This happens if there is a discrepancy between the hostname in these two files:
/etc/hosts
/etc/hostname

Plus I also read, you changed your hostname from "abraham -laptop" to "abraham laptop". I had asked you to eliminate the space - "abraham-laptop".

Let's do two things now. Eliminate the space and make /etc/hosts and /etc/hostname read the same.

Jot down the next few lines on paper:

Reboot. In GRUB, select the second entry, "Recovery Mode". Drop to a root shell and type:

nano /etc/hosts

Hit Enter. On the top you'll see

127.0.0.1 localhost
127.0.1.1 SOMETHING

change SOMETHING to abraham-laptop, then press Ctrl+O (letter o, not zero) to save, then Ctrl+X to exit.

Now type

nano /etc/hostname

Hit Enter. This will only contain one line, replace it by abraham-laptop. If there's more than one line, delete everything. It should only read abraham-laptop.

Reboot. Now worry about the other problem as described above.

An addition: Obviously you need to save the second file also, just like you did with the first.