Whenever I try to run a program from gnome, I get messages like
Authenticated is required to run the Gparted Partition Editor
The same goes for all programs that need root permission and I try to run from 'System tools' in my gnome-fallback.
However the same user can become root in gnome terminal with no problem (I added the user to sudoers). I must mention that I've changed the user's password after OS install, so I think I need to update something but don't know what. I appreciate your hints.