This looks like a problem with the apparmour config for cups, I suggest if you
add /dev/ttyUSB* to /etc/apparmor.d/usr.sbin.cupsd
in the same way as the /dev/ttyS* rw, line it should fix it.
Dave
** Changed in: cups (Ubuntu)
Status: New => Confirmed
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USB attached serial ports have permissions problems
https://bugs.launchpad.net/bugs/587409
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