I run Ubuntu 12.04. After installation I have disabled guest account, removed error notification, gave myself super user rights.
I made some applications in
/usr/applications useable only for me, created standard user account.
Then I pressed restart in shut down menu, but system just logged off. After rebooting by Terminal there was "Failed to load "ubuntu"" notification.
I don't know if it was my fault, but really have to fix that problem. By the way, I have no internet access for that PC. Hope you will help me!