DNF Trying to Use SQLite Backend Warning

If you keep getting the following warning after upgrading to Fedora 33:

warning: Found bdb Packages database while attempting sqlite backend: using bdb backend.

Try rebuilding RPM database:

rpmdb --rebuilddb

If that results in:

error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)

Your selinux permissions are broken due to a bug. Use restorecon to restore them to defaults:

restorecon -Rv /var/lib/rpm

You should now be able to rebuild the RPM database:

rpmdb --rebuilddb

References

See also

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