Sorry, forgot to add that I also did: $ sudo dpkg-reconfigure gdm
and now I no longer get the 256 error. So in summary: I- [Could not update ICEauthority file /var/lib/gdm/.ICEauthority] Resolved by changing Owner etc permissions via 'gksu nautilus' to: Owner: gdm - Gnome Display Manager Access: Read and Write Group: gdm Access: none Others Access: None II- [This is a problem with the configuration sever. (usr/lib/libgconf2-4/gconf-sanity-check-2 exited with status 256)] Resolved by: $ sudo chmod 755 /etc/gconf/gconf.xml.system $ sudo dpkg-reconfigure gdm Hope that helps someone else with the same issues. -- GDM fails to authenticate pre-existent users. https://bugs.launchpad.net/bugs/432492 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs