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I am new to Ubuntu and I discovered that I can't shut down (then black screen with some lines of text shows) and reboot (then the purple screen with dots appear). I need to hold the power button in order to turn it off. What is causing this? Should I install the 32 bit version instead?

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There's a bug for both 11.10 and 12.04 on the Dell M6600 laptaps

Summary:

Modify /etc/default/grub to read:

GRUB_CMDLINE_LINUX_DEFAULT="reboot=pci"

Then run sudo update-grub - After another reboot you should be good to go.

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