Comment 2 for bug 90242

Repeatable on my side. There is one more detail: I actually see two kubuntu logos flashing on the screen for a fraction of a second, then the progress bar appears (and the logo is nowhere).

This machine has a nVidiaGeForce 6100, with the nVidia restricted module.

Looking at syslog I see two kdm_greet messages, one at bootup stating "Can't open default user face", and one at shutdown stating "Internal error: memory corrupting detected". Don't know if this is related.