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After I installed ubuntu 11.04, it wont shutdown nor restart, it just freeze, and I have to hold the power button in order to turn off my netbook. (It also happens on livecd)

Can anyone tell me the solution for this?

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Same thing happens to me sometimes but not always, I am then forced to do "sudo shutdown now; exit" from Terminal to ask to shutdown. – Madhava Apr 29 '11 at 3:43

This is a bug related with wireless driver. This bug has been reported in launchpad. Asolution is mentioned in Ubuntuforums post here.

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What you can do as workaround is to type these commands in a terminal:

To turn the PC off : sudo shutdown -h now

To restart the PC : sudo shutdown -r now

...anyway this won't solve your problem permanently.

I noticed that when you do some stuff like mounting drives (as root) and you try to turn your PC off from a regular user, you are not allowed. Which is good in terms of security for a Server, but too secure for a Home PC.

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