I think I found the culprit: I was modifying an AppArmor profile for
Thunderbird.  When I executed aa-logprof, I got the following message:

Enforce-mode changes:                                                           
                                                                                
                                                     
                                                                                
                                                                                
                                                     
Profile:    /usr/sbin/cupsd                                                     
                                                                                
                                                     
Capability: block_suspend                                                       
                                                                                
                                                     
Severity:   unexpected capability rank input: CAP_BLOCK_SUSPEND

If you select "Allow", you will run into the problem mentioned above.

I've no idea why creating/modifying a Thunderbird profile affects the
cupsd profile and why that capability is added.

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https://bugs.launchpad.net/bugs/1052098

Title:
  AppArmor parser error for /etc/apparmor.d/usr.sbin.cupsd

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