Comment 10 for bug 106217

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Ludi Maciel (iludi-deactivatedaccount) wrote : Re: hidden file controlling NVIDIA driver does not get removed when switching from nvidia-glx-new back to nvidia-glx causing X not to start due to mismatch of versions

I can confirm this problem too.
I had to manually remove all nvidia modules and reinstall (using dpkg, since apt-get nvidia-glx require an old module/kernel version) the nvidia-glx & restricted-modules again. It's working now.