After some tests, option (1) is out of the table: even using --no-restart-after-upgrade won't work if we still pass --no-start to dh_installsystemd. The way forward here is to remove --no-start from dh_installsystem.
After some tests, option (1) is out of the table: even using --no-restart- after-upgrade won't work if we still pass --no-start to dh_installsystemd. The way forward here is to remove --no-start from dh_installsystem.