Bug#1039103: mrtg.cfg not moved to new location in /etc/mrtg/ when upgrading from bullseye to bookworm

Dear Konrad, Due #1041332, I reopened this bug some days ago. The Debian Policy[1], in its clause 10.7.3, doesn't allow the install system to modify (moving) configuration files. IMO, the best way for MRTG is to show a message to users asking for a manual action. I will do an upload to provide

Bug#1039103: mrtg.cfg not moved to new location in /etc/mrtg/ when upgrading from bullseye to bookworm

Control: reopen 1039103 Reopening this bug due issues from #1040860. Regards, Eriberto