Comment 106 for bug 987220

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John Need (john-need) wrote : Re: System does not power off reliably when "Shut Down" chosen from GUI

Lucy O'Neill's a genius. Her fix worked for me. I'm running a Dell Inspiron 1720 with an NVidia card. Here's what I did

gksudo gedit /etc/default/grub

Replaced e the line GRUB_CMDLINE_LINUX="" with GRUB_CMDLINE_LINUX="acpi=on" and saved the file

sudo update-grub

Rebooted (I had to hold the power button)

Shutdown (Did not have to hold the power button)