I have the same problem, but it only happens to be on startup. My system
is set to automatically log in.

When I first turn on my machine, it logs in and I am able to launch
programs etc. after a short while (maybe a minute or two) I notice some
strange graphical artifacts near the top of the screen, it is hard to
describe but something along the lines of a few rows of blinking
rectangles. I then get logged out, after which I can log back in and I
have no further problem.

I have no idea what package might have caused this.

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https://bugs.launchpad.net/bugs/980519

Title:
  Random log off in Ubuntu 12.04 LT Beta

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