Public bug reported:

On install:

Setting up python3-rtslib-fb (2.1.74-0ubuntu1) ...
Job for rtslib-fb-targetctl.service failed because the control process exited 
with error code.
See "systemctl status rtslib-fb-targetctl.service" and "journalctl -xe" for 
details.
invoke-rc.d: initscript rtslib-fb-targetctl, action "start" failed.
● rtslib-fb-targetctl.service - LSB: Start LIO targets
     Loaded: loaded 
(]8;;file://autopkgtest/etc/init.d/rtslib-fb-targetctl/etc/init.d/rtslib-fb-targetctl]8;;;
 generated)
     Active: failed (Result: exit-code) since Tue 2021-02-23 
18:03:16 UTC; 10ms ago
       Docs: 
]8;;man:systemd-sysv-generator(8)man:systemd-sysv-generator(8)]8;;
    Process: 3296 ExecStart=/etc/init.d/rtslib-fb-targetctl start 
(code=exited, status=1/FAILURE)

Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]:     errors = 
RTSRoot().restore_from_file(restore_file=from_file)
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]:   File 
"/usr/lib/python3/dist-packages/rtslib_fb/root.py", line 88, in __init__
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]:     self._set_dbroot()
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]:   File 
"/usr/lib/python3/dist-packages/rtslib_fb/root.py", line 182, in _set_dbroot
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]:     raise 
RTSLibError("Cannot set dbroot to {}. Please check if this directory exists."
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3308]: 
rtslib_fb.utils.RTSLibError: Cannot set dbroot to /etc/rtslib-fb-target. Please 
check if this directory exists.
Feb 23 18:03:16 autopkgtest rtslib-fb-targetctl[3296]:    ...fail!
Feb 23 18:03:16 autopkgtest systemd[1]: 
rtslib-fb-targetctl.service: Control process exited, 
code=exited, status=1/FAILURE
Feb 23 18:03:16 autopkgtest systemd[1]: 
rtslib-fb-targetctl.service: Failed with 
result 'exit-code'.
Feb 23 18:03:16 autopkgtest systemd[1]: Failed to 
start LSB: Start LIO targets.
dpkg: error processing package python3-rtslib-fb (--configure):
 installed python3-rtslib-fb package post-installation script subprocess 
returned error exit status 1



^^ this affects Groovy and Focal ^^

The reason is this:
$ dpkg -L python3-rtslib-fb
/etc/init.d/rtslib-fb-targetctl
/lib/systemd/system/target.service


This used to be (Focal and Debian)
/etc/init.d/rtslib-fb-targetctl
/lib/systemd/system/rtslib-fb-targetctl.service


That has two issues
1) since the name of service and sysv-init mismatches the sysV generator 
creates an extra service from the sysV script
2) the service does no more contain the mkdir that is required (and was in 
Focal/Debian)
  ExecStart=mkdir -p /etc/rtslib-fb-target

We can merge back what we had, and thereby fix Hirsute.
I'm not sure on a groovy SRU - if someone has manually fixed the old service 
(manual mkdir, enable it, ...) or any such then the fix will remove 
target.service and things will behave differently.
But fixing in Hirsute be better in any case and also help 20.04 -> 22.04 
upgrades to have no hiccup.

** Affects: python-rtslib-fb (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1916715

Title:
  fails on install due to systemd-service/sysv-service mismatch and lack
  of mkdir

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