There is one physical VGA connector on the card, and no other video
output such as a TV out connector, so I certainly didn't deliberately
configure more than one monitor. I am reasonably certain that this
specific CRT is also the only monitor that has been connected to this
box since Ubuntu was installed at all.

I had used the GNOME tools to change the display resolution, and been
puzzled by that setting not sticking across a power cycle. After
changing it a second time, it appeared to stick, and I stopped worrying
about it. Shortly after that an update to the kernel, gdm and the
screensaver (among other random things) was pushed and I had this
problem.

It doesn't look like the GNOME tools allow configuring a second monitor
if one isn't actually plugged in and available so it should be hard to
do by accident.

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Login with GNOME or Failsafe GNOME session goes black then back to login screen
https://bugs.launchpad.net/bugs/495252
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