No user/password boxes on login screen after updates today (June 30, 2012)

Posted by Tony on Ask Ubuntu See other posts from Ask Ubuntu or by Tony
Published on 2012-06-30T22:40:41Z Indexed on 2012/07/03 3:24 UTC
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login-screen

Just installed today's batch of updates, including new kernel 3.2.0-26 and rebooted. Now the screen just has a logo in the middle and "Ubuntu 12.04 LTS" in bottom left corner, but no box to choose which user to log in as, or to enter a password. CTRL-ALT-F1 gets me to a "login:" prompt, and I can log in - but I have no idea what to look at to find out what is wrong, or to fix this.

Tried older kernels and recovery mode for current kernel - no joy, still no way to log into the graphics console.

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