How did you obtain the ml1610.service file which you have attached?
What is the output which you get with
/usr/lib/cups/backend/dnssd
What is the output of
ls -l /usr/lib/cups/backend
** Changed in: system-config-printer (Ubuntu)
Importance: Undecided => Medium
Status: New => Incomplete
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no driver suggestion for Avahi-discovered printers
https://bugs.launchpad.net/bugs/278271
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