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I have Ubuntu 12.04 And my problem is that the WiFi is disabled. It says that the WiFi hardware is disabled and it does not switch on when i switch on the WiFi . The control always shows that WiFi is switched off.

The same computer has windows too and my WiFi works just fine in it.

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You have to share more info. At the very least the output of sudo lshw -class network see also askubuntu.com/questions/127977/… –  Captain Giraffe Oct 2 '12 at 11:14
We need more hardware information to help you, can you look at this question and then edit your question adding the information. –  Jorge Castro Oct 13 '12 at 20:32

3 Answers 3

Maybe you need proprietary drivers for you card. Try get connected another way: with android phone, or LAN cable. Then go to System Settings -> Additional Drivers. Check if there some suggestions, and install it.

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For me the BIOS was already showing Wifi enabled, but to get around the hardware locked situation, I had to disable the Wifi in the Bios (save changes & exit) boot to Ubuntu, then shut down, reboot back to Bios, enable the Wifi (save changes & exit) and back into Ubuntu.

This time the Wifi menus were there.

Note previously I had turned off airplane mode in Network->Wifi settings.

(Compaq 6910p with Intel 4965 Wifi)

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Following this link should work for you:

Try shutting down(if not already off), disconnecting the power, remove battery(if it is a laptop), press power a few times to release stored energy, reinsert battery(if it is a laptop), reconnect AC power. Turn on computer. Worked for me.

After trying multiple fixes I found on the internet I remembered reading this somewhere. My hardware was blocked via a hardware switch(Fn+F8) which doesn't work in Ubuntu (works with windows, but uninstalled windows).

rfkill showed 0: phy0: Wireless Lan as Hard Blocked.

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