Comment 77 for bug 531190

For everyone suffering from an immediate ticket to oblivion when disconnecting the charger on laptops with buggy suspend:

Alt-F2 and launch gconf-editor
Navigate to apps>gnome-power-manager>actions
Change the value of critical_battery to "nothing"

Credit: http://ubuntuforums.org/archive/index.php/t-1555188.html slush1000