Thermal printer service doesn't start

I noticed a comment at bottom of that section in /etc/apparmor.d/usr.sbin.cupsd:

  # Site-specific additions and overrides. See local/README for details.
  #include <local/usr.sbin.cupsd>

So I think the DevTerm specific fix could go there instead. (Funny enough, the README file they mention doesn’t exist!) I’m not sure how these files get updated, but I’m guessing some kind of package update might wipe out the file you suggested at some point, while this user file might be left alone. Just a guess though. I’m not sure how all this stuff is supposed to work. (The “local” file existed, but was empty on my DevTerm.)

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If you installed the armbian wiringpi package you’ll get this error.

Try removing it and installing just the CPI version either from apt or source