Hi,
I am experiencing a very strange thing for which there are no ready answers by googling. I am a volunteer for a non-profit which puts GNU-Linux computers in low income shelters. They are stand-alone machines connected directly to the Internet via a hub on a dedicated ethernet cable.
The shelters don't want the users to be able to store anything directly to the machine's hard drive. To give them that functionality, we ask them to use the guest session, which wipes out all data by default when the session ends.
Right now, however, we are experiencing a failure of logging into the guest session. Normally, you just choose the guest session in the Lubuntu login screen, and hit enter, and it boots up a full guest session. No password is required.
Now, when I chose the guest session and hit enter, the system appears to head toward a normal login, but then quickly fails and returns to the login screen.
The system's SU admin account is performing normally. To get into the admin account, I just choose it in the login screen, enter the password, and the admin session boots up normally.
This whole thing is very strange, and I have never seen anything like it before. We are using 14.04 on 13 machines with identical or similar hardware and are not having any such problems. This email is being written on one of those such machines, and the guest session works just fine.
I ran updates on the malfunctioning machines, rebooted, no joy.
Thanks very much in advance.