On 10/5/2015 10:13 AM, Peter Easthope wrote: > > The problem described by Mikko Koho occurs in a jessie system here. > > ii gparted 0.19.0-2 i386 GNOME partition editor > > root@joule:/home/peter# gparted > No protocol specified > > (gpartedbin:1835): Gtk-WARNING **: cannot open display: :0 > > In other jessie systems, gparted works. So the problem is > not fictitious but doesn't happen in every jessie.
It appears that you do not have your DISPLAY environment variable set, so no X11 apps will work.
