Comment 5 for bug 1575572

Indeed this isn't related to native systemd units vs. sysvinit scripts.

> honor this historical behavior by making the 'runlevel' command return the target runlevel when called from a systemd unit that's run at boot, even if that target has not yet been reached.

OK, I wasn't aware of that. I'll look into that.

> d.) output of runlevel is stored in RL and then it goes looking for an SLINK or SSLINK (/etc/rc$RL.d/S??apache2 or /etc/rcS.d/S??apache2). Neither of these exist so it exits without starting the service.

To be sure we are talking about the same thing: Surely update-rc.d should run before invoke-rc.d in the postinst, so the links should exist in rc[2345].d/. This is solely about $RL having the wrong value here, not about the links not existing at all, right?