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When I select "restart" with 12.04 it begins the process, then stays forever stuck on the 3rd or 4th "dot" with the Ubuntu logo and never restarts so I don't have a choice but to force my iMac to shutdown.

Couldn't see any report of this issue anywhere. Does it ring a bell to someone? And is there a way to fix it?

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maybe ACPI is not enabled

  1. try to shutdown using sudo shutdown -h now
  2. update your bios (if applicable)
  3. install acpi using sudo apt-get install acpid and try to shutdown again
  4. when the shutdown hangs press the left arrow key to see the diagnostics
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Thanks for the suggestion but this didn't seem to work. 1/ sudo shutdown -h now shuts down the computer (which works fine) but the problem I have is with restarts only 2/ acpid is already installed and the left arrow key didn't trigger anything. – vanz Sep 21 '12 at 16:37

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