You need to modify the file /etc/default/grub this way:
1. remove the line 
acpi=off apm-power_off

2. change the line 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to 
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off apm=power_off"

-- 
package linux-image-2.6.31-19-generic 2.6.31-19.56 failed to install/upgrade: 
exit status 127 - /etc/default/grub: 11: apm-power_off: not found
https://bugs.launchpad.net/bugs/548492
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