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Make Ubuntu sleep instead of hibernate
One of the few things you can’t easily configure in Ubuntu is the option to make the computer sleep instead of hibernate when idle for X minutes. Here’s how to do it:
Press Alt+F2 and type gconf-editor then press Enter
Go to /apps/gnome-power-manager/actions/critical_battery
Change the value to whatever you wish. Possible values are hibernate, suspend, shutdown and nothing.