The other service files use -f, but it looks like bacula-sd was broken by this
change:
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commit e40b2a6ba9bf946b6e8f189e86729b7b262aaee6
Author: Alain Spineux
Date: Wed Dec 2 16:17:54 2020 +0100
Fix #7113 Enable t
While bacula-sd would start fine when run manually at the command-line
with "/opt/bacula/bin/bacula-sd", running it as a systemd service
consistently resulted in the daemon starting and then stopping almost
immediately, with no errors from bacula-sd and with systemd reporting
just an 'unknown error
