Try the other F-Keys. For some set-ups w/ X as default
run-level there's only one console, often on F6.
If that's not it use /etc/init.d/{xkg}dm stop to get to
a console (for NVidia the Ctrl-Alt-thing won't do it anyway).
Cheers,
Tink
P.S.: You'll get better answers w/ better input, e.g. the
Ubunut version and the graphics card make and model.
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