I did the following:
till@till-x1carbon:~$ sudo -i
[sudo] password for till:
root@till-x1carbon:~# systemd-analyze set-log-level debug
root@till-x1carbon:~# systemctl stop cups.service
Warning: Stopping cups.service, but it can still be activated by:
cups.path
cups.socket
root@till-x1carbon:~# sleep 4
root@till-x1carbon:~# touch /var/cache/cups/org.cups.cupsd
root@till-x1carbon:~# sleep 4
root@till-x1carbon:~# sudo rm /var/cache/cups/org.cups.cupsd
root@till-x1carbon:~# sleep 4
root@till-x1carbon:~# systemctl stop cups.service
Job for cups.service canceled.
root@till-x1carbon:~# systemd-analyze set-log-level info
root@till-x1carbon:~# journalctl -b > /tmp/journal.txt
root@till-x1carbon:~#
And as you see, I could reproduce the error ("Job for cups.service
canceled.").
journal.txt attached.
** Attachment added: "/tmp/journal.txt"
https://bugs.launchpad.net/ubuntu/+source/init-system-helpers/+bug/1642966/+attachment/4786413/+files/journal.txt
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https://bugs.launchpad.net/bugs/1642966
Title:
package cups-daemon 2.1.3-4 failed to install/upgrade: subprocess new
pre-removal script returned error exit status 1
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