Something (odd) happened...
Lubuntu 12.04 On a Fujitsu Amilo Pro laptop, 2.5G celeron, 512M of RAM, 40G disk.
The old "sacrificial" machine has "had a moment".
I can still login as root, can create and become a new user etc, but my original login fails, just bouncing round and round to a "different than before" login dialog.
No update happened at that time, it was working 100% the evening before, NOT connected to the LAN, shutdown OK, then the following morning (yesterday) it was totally p'd off with life.
I've gone through all the usual procedures I can find to reset the account password, all appear to work OK, but there is obviously something corrupt with that account.
The machine (old though it is) has passed all the hardware diag 's and tests I could throw at it. Including an overnight MEMTEST86, and a level 4 Spinrite earlier today. No problems found.
Also, as a new user, sudo fails with the known good root password! (Interestingly, it asks for "your" password, not root's. That doesn't help either.)
Before I archive some of the stuff I was working on (scripts etc, NONE that get invoked at start up) flatten the box and reload with the later 14.04 release. Any comments as to what might have happened, and how to avoid it in the future, prepare some "get out of jail" backup plan, or even recover from it.
Only, because in a couple of weeks I'll be relying on another Lubuntu 12.04 machine running my mob ile dual band APRS setup, and I'd not like it if that went belly up in the middle of things.
Another clue. Shutting down hangs, even as root! It's trying to stop bind, and/or the ntpd daemon. That's about the most I can find out with my limited knowledge of Linux "under the hood".