Ubuntu Hangs on Shutdown
When you shut down your Ubuntu computer, you want it to turn off completely. If it hangs during the process and doesn't turn off, you there are a number of problems you could have. The problem could be either hardware or software related.
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Grub Problem
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If Ubuntu hangs at the splash screen during shutdown, you may have an issue with your Grub configuration file. You can edit the file from the terminal by typing, "sudo gedit /etc/default/grub." Search for the line with "quiet splash" and change it to "quiet splash acpi=force." Save and close the file. Type "sudo update -grub" to update Grub's configuration. This should fix the problem of Ubuntu hanging at the splash screen.
Mounted Drives
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When you mount an external drive in Ubuntu, the system sometimes has a difficult time shutting down with the drive mounted. This can happen with some Windows partitions and USB drives. To solve the problem and shut down your computer, right-click the drive image on your desktop or folder manager. Select "dismount." Try shutting the computer down to see if the problem continues.
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Hardware Problems
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If you have an incorrect or corrupted driver installed in Ubuntu, the operating system might have problems shutting down as it will not be able to communicate with the hardware to issue the proper shutdown command. To see if this is the case, perform a hard reset by holding down your power button at the point that Ubuntu hangs while shutting down. Boot from a Live Installation CD. By navigating to your computer's "/var/log/dmesg file" you can see what it says. The last entry should give you an indication of what the problem is.
Getting Help
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As the shutdown problem in Ubuntu can be a number of things and is often a hardware problem, you need to get help for your specific hardware. Try searching for help for your computer's manufacturer and model. If you cannot find anything, ask for assistance at UbuntuForums.org or report a bug to Launchpad.
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