[ubuntu] I can't shut down my computer!

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http://ubuntuforums.org – After installing Ubuntu 12.04 on my new laptop with windows 7 kept, I found that I can not shut Ubuntu down now. Previously I can shut down normally right after installation, but now it never shut down. Each time it just keeps restarting the machine. I found the following threads and followed what suggested there by using boot-repair. But it helps nothing. The problem still persists! It has been so frustrated with the new Ubuntu this time. Big problems keep taking place since the first day after installation. :( http://askubuntu.com/questions/13016...-of-a-shutdown https://help.ubunt (Hardware)