The `xhost +` solution is a pretty big security flaw I think. It's better to use `su -c gparted` in a terminal (or `kdesu gparted` for a more graphical solution if you use KDE). Try those and report back -- I would strongly advise against using `xhost +`, since it grants X access to everyone that can access your PC (including outsiders). You *could* in theory use `xhost +user` or `xhost +localhost` (I think -- the syntax may be wrong since I've never actually used it, but the general idea is right), but it's still WAY better to just use su, sudo or kdesu (which is just a graphical su).
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