Ubuntu 10.04 TLS wireless issues

Hardware: Dell D830 Latitude

I am a Linux newbie. I installed Ubuntu 10.04 using wubi installer in my Windows 7 laptop.

When I installled and ran it for the first time it asked me for the wep key I provided it , connected and was able to browsed Internet just fine. I installed Chromum browser. I shut it down and today I cannot access wireless and the "Enable wireless" option is greyed out.

On the Windows 7 install the wireless is just fine

Any ideas how to solve it?
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TobiasHolmConnect With a Mentor Commented:
Also try this:

"1. I switched wireless OFF with the hardware wireless switch and restarted the box.
2. After logging in (and checking that "enable wireless" check box was grayed out - this time for a good reason) I changed the hardware switch to the ON state and now the "enable wireless" check box was not grayed out and switched ON; everything was working again."

$ sudo ifconfig wlan0 up
Run the following command in the terminal:

sudo rfkill list

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Do you get any "Hard blocked: yes" or "Soft blocked: yes" entries?
Then this may indeed be a case where Ubuntu does not correctly interpret the WLAN killswitches, so play around with the keyboard 'Fn + Enable/Disable Wlan' key, and check the laptop manual for a hardware switch that you may click. (It does not matter that WLAN works under Windows; Windows uses specific drivers as supplied by hardware manufacturers, Linux has to learn to support all hardware features by itself, so an occasional 'misunderstanding' of a brand specific button can occur.)

You may also want to try:

sudo rfkill unblock all

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Yet another method that is reported to have worked for some Dell laptops is this command:

sudo rmmod -f dell-laptop

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JohnRamzAuthor Commented:
Thanka Tobias. Turning the switch off and rebooting did the trick.
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