see comment #3, forgot to add:
sudo apparmor_status
4 processes are in enforce mode.
   /usr/sbin/cups-browsed (188070) 
   /usr/sbin/cupsd (188069) 
   /usr/lib/cups/notifier/dbus (188098) /usr/sbin/cupsd
   /snap/canonical-livepatch/95/canonical-livepatchd (956) 
snap.canonical-livepatch.canonical-livepatchd

dmesg:
 [42055.571610] audit: type=1400 audit(1589134509.618:1427): apparmor="DENIED" 
operation="open" profile="/usr/sbin/cupsd" 
name="/proc/sys/kernel/random/boot_id" pid=188069 comm="cupsd" 
requested_mask="r" denied_mask="r" fsuid=0 ouid=0

Using: 
sudo aa-complain usr.sbin.cupsd
sudo aa-complain /usr/sbin/cups-browsed
removed the error messages.

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https://bugs.launchpad.net/bugs/1873764

Title:
  CUPS Apparmor Error opening /proc/sys/kernel/random/boot_id

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