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. Regards, ... Peter E. -- Telephone 1 360 639 0202 or +13606390202. Bcc: peter at easthope.ca http://easthope.ca/Shop.html