Discovered this was a system-wide problem, not specifically related to cups.
Backup program was holding open a very high number if inotify watches and this
was causing issues for other programs (including cups).
Solution was to add a conf file in /etc/sysctl.d that set a higher value for
** Changed in: cups (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1952164
Title:
cups.path repeatedly goes into systemd failed state
To manage notifications
