i have the same problem.
I have nvidia-96 package installed.
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Mouse and keyboard stop working after selecting user
https://bugs.launchpad.net/bugs/553200
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desktop-bugs
for me reinstall of gnome-session doesn't work.
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GDM login fails with regular gnome-session (lucid, i386)
https://bugs.launchpad.net/bugs/526379
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I have the same problem with lucid lynx beta 1/2.
If I stop GDM with sudo service gdm stop and then launch x via normal
startx everything work fine.
But if i try to login with GDM, after clicking on a user, gdm restart
itself.
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GDM login fails with regular gnome-session (lucid, i386)
