So, you are in rolling and some sneaky bug got past Sid and KABLOOM, you have problems. This might help you
Via Planet Debian Original post is probably in French, so that is an option He is an active Debian Dev.
https://vincent.bernat.ch/en/blog/2020-downgrade-debian
QuoteLet's suppose we want to go back to January, 20th 2020. In /etc/apt/sources.list.d/snapshot.list, we add a date-specific snapshot as a source:
deb [check-valid-until=no] https://snapshot.debian.org/archive/debian/20200120T111800Z/ unstable main contrib non-free
Note: the forum mangles urls at times - the "unstable main contrib non-free" belongs in the URL of the deb line
No I have not done it yet. So if it does not work, don't blame me, but I will probably try it in Sid sometime. Merde, I worked over 80 hours last week.
peace out