Error when trying to run an app with sudo or gksudo

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http://askubuntu.com – I'm not sure what happened. A few days ago I installed some updates and now i get an error whenever I try to run sudo nautilus. If I run gksudo nautilus it hangs for a few seconds then does nothing. Anyone else had the same issue, or know how to fix it? A similar thing happens when trying to run sudo gedit as well... attempts to sudo other apps: Sudoers as requested: (HowTos)