I also needed to downgrade when the nvidia driver was broken a few weeks
ago. I managed to do so as root using dpkg with the -i option.
Note that apt-get from that moment on complained about some broken
packages on my system (until I did a dist-upgrade when the nvidia driver
was fixed).
For downgrading, I simply used the previous version of the packages, as
found in my /var/cache/apt/archives folder.
If you cannot find the packages there, you can try to search them via
http://snapshot.debian.net/
hth,
Stefaan.
What packages do I need to downgrade, and where can I find those
versions?
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