Comment 19 for bug 1822062

# VERIFICATION: COSMIC
- Using the reproducer defined in the test case and the version in -updates:

ubuntu@cosmic-sssd-ad:~$ dpkg -l | grep -E "cups-daemon| cups |cups-common"
ii cups 2.2.8-5ubuntu1.2 amd64 Common UNIX Printing System(tm) - PPD/driver support, web interface
ii cups-common 2.2.8-5ubuntu1.2 all Common UNIX Printing System(tm) - common files
ii cups-daemon 2.2.8-5ubuntu1.2 amd64 Common UNIX Printing System(tm) - daemon

ubuntu@cosmic-sssd-ad:~$ grep -i systemgroup /etc/cups/cups-files.conf
SystemGroup <email address hidden>
ubuntu@cosmic-sssd-ad:~$ systemd-analyze critical-chain cups.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

cups.service @5d 44min 19.075s
└─basic.target @32.610s
  └─sockets.target @32.602s
    └─snap.lxd.daemon.unix.socket @2min 24.862s
      └─snap-lxd-10601.mount @2min 1.485s +39ms
        └─local-fs-pre.target @8.493s
          └─systemd-tmpfiles-setup-dev.service @8.103s +386ms
            └─systemd-sysusers.service @7.546s +550ms
              └─systemd-remount-fs.service @7.143s +373ms
                └─systemd-journald.socket @7.033s
                  └─-.mount @6.938s
                    └─system.slice @6.938s
                      └─-.slice @6.938s

- After reboot, cups fails to start:

ubuntu@cosmic-sssd-ad:~$ systemctl status cups
● cups.service - CUPS Scheduler
   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Tue 2019-05-07 10:06:49 UTC; 57min ago
     Docs: man:cupsd(8)
  Process: 1173 ExecStart=/usr/sbin/cupsd -l (code=exited, status=1/FAILURE)
 Main PID: 1173 (code=exited, status=1/FAILURE)

May 07 10:06:49 cosmic-sssd-ad systemd[1]: cups.service: Service RestartSec=100ms expired, scheduling rest
May 07 10:06:49 cosmic-sssd-ad systemd[1]: cups.service: Scheduled restart job, restart counter is at 5.
May 07 10:06:49 cosmic-sssd-ad systemd[1]: Stopped CUPS Scheduler.
May 07 10:06:49 cosmic-sssd-ad systemd[1]: cups.service: Start request repeated too quickly.
May 07 10:06:49 cosmic-sssd-ad systemd[1]: cups.service: Failed with result 'exit-code'.
May 07 10:06:49 cosmic-sssd-ad systemd[1]: Failed to start CUPS Scheduler.
ubuntu@cosmic-sssd-ad:~$ grep cupsd /var/log/syslog | grep -v kernel
May 7 10:06:45 cosmic-sssd-ad cupsd[1033]: Unknown SystemGroup "<email address hidden>" on line 19 of /etc/cups/cups-files.conf.
May 7 10:06:45 cosmic-sssd-ad cupsd[1033]: Unable to read "/etc/cups/cups-files.conf" due to errors.
May 7 10:06:47 cosmic-sssd-ad cupsd[1122]: Unknown SystemGroup "<email address hidden>" on line 19 of /etc/cups/cups-files.conf.
May 7 10:06:47 cosmic-sssd-ad cupsd[1122]: Unable to read "/etc/cups/cups-files.conf" due to errors.
...

- Using the version in -proposed, after rebooting, cups works fine:

ubuntu@cosmic-sssd-ad:~$ dpkg -l | grep -E "cups-daemon| cups |cups-common"
ii cups 2.2.8-5ubuntu1.3 amd64 Common UNIX Printing System(tm) - PPD/driver support, web interface
ii cups-common 2.2.8-5ubuntu1.3 all Common UNIX Printing System(tm) - common files
ii cups-daemon 2.2.8-5ubuntu1.3 amd64 Common UNIX Printing System(tm) - daemon

ubuntu@cosmic-sssd-ad:~$ systemctl status cups
● cups.service - CUPS Scheduler
   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-05-07 11:13:20 UTC; 58s ago
     Docs: man:cupsd(8)
 Main PID: 1297 (cupsd)
    Tasks: 1 (limit: 2361)
   Memory: 2.7M
   CGroup: /system.slice/cups.service
           └─1297 /usr/sbin/cupsd -l

May 07 11:13:20 cosmic-sssd-ad systemd[1]: Started CUPS Scheduler.

ubuntu@cosmic-sssd-ad:~$ systemd-analyze critical-chain cups.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

cups.service @1min 6.619s
└─sssd.service @54.111s +12.499s
  └─basic.target @54.032s
    └─sockets.target @54.030s
      └─snapd.socket @53.965s +61ms
        └─sysinit.target @53.361s
          └─cloud-init.service @48.760s +4.493s
            └─systemd-networkd-wait-online.service @46.946s +1.809s
              └─systemd-networkd.service @46.237s +675ms
                └─network-pre.target @46.230s
                  └─cloud-init-local.service @22.765s +23.458s
                    └─systemd-remount-fs.service @10.923s +199ms
                      └─systemd-journald.socket @10.574s
                        └─system.slice @10.466s
                          └─-.slice @10.466s

- Using the version in -proposed, with sssd not installed in the machine (and setting SystemGroup to the original local group "lpadmin"), cups still starts:

ubuntu@cosmic-sssd-ad:~$ systemctl status cups
● cups.service - CUPS Scheduler
   Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2019-05-07 11:21:12 UTC; 1min 16s ago
     Docs: man:cupsd(8)
 Main PID: 955 (cupsd)
    Tasks: 1 (limit: 2361)
   Memory: 3.7M
   CGroup: /system.slice/cups.service
           └─955 /usr/sbin/cupsd -l

May 07 11:21:12 cosmic-sssd-ad systemd[1]: Started CUPS Scheduler.

ubuntu@cosmic-sssd-ad:~$ systemd-analyze critical-chain cups.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

cups.service @41.284s
└─basic.target @41.231s
  └─sockets.target @41.228s
    └─snapd.socket @41.024s +200ms
      └─sysinit.target @40.998s
        └─cloud-init.service @33.042s +7.648s
          └─systemd-networkd-wait-online.service @31.517s +1.510s
            └─systemd-networkd.service @31.378s +130ms
              └─network-pre.target @31.367s
                └─cloud-init-local.service @17.766s +13.595s
                  └─systemd-remount-fs.service @7.097s +411ms
                    └─systemd-journald.socket @7.053s
                      └─-.mount @6.984s
                        └─system.slice @6.984s
                          └─-.slice @6.984s