It seems that disabling apparmor removes the message:
kernel: [ 194.693603] audit(1208351567.253:3): type=1503
operation="inode_permission" requested_mask="::rw" denied_mask="::rw"
name="/dev/tty" pid=6807 profile="/usr/sbin/cupsd" namespace="default"
And printing resumes.
** Also affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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HP PSC 750 Printer Regression: unable to connect hpssd socket 2207: Connection
refused.
https://bugs.launchpad.net/bugs/218921
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