On 09/08/2021 01:13, François Patte wrote:

2- So, I tried to downgrade firefox using dnf downgrade but:
can't create transaction lock on /var/lib/rpm/.rpm.lock
????
After some researches, I found that I have to do:
/sbin/restorecon -v /var/lib/rpm/.rpm.lock
and then:
rpmdb --rebuilddb
But this failed for the same reason : "can't create etc...." I had to do:
ausearch -c "rpmdb" --raw | audit2allow -M my-rpmdb
semodule -X 300 -i my-rpmdb.pp

At last I could downgrade firefox... And I added excludepkgs=firefox in 
dnf.conf file.

3- There is a service: rpmdb-rebuild.service but it is impossible to start this service 
for the same reason "can't create transaction lock on /var/lib/rpm/.rpm.lock"
"rpmdb-rebuild.service: Main process exited, code=exited, status=255/EXCEPTION"

Use lsof to see if any process owns /var/lib/rpm/.rpm.lock

If not, delete the lock file and try again.

FYI, in order to run rpmdb-rebuild.service the file /var/lib/rpm/.rebuilddb 
must exist.  So, touch it before
running the service.

--
Remind me to ignore comments which aren't germane to the thread.
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