Hi @desconocido
I’m definitely seeing this at least 3 places:
Ubuntu-Mate 16.04 with Mate 1.16.1 ppa
Ubuntu-Mate 16.04 VM (no printers ever setup)
Ubuntu Server 16.04 (with no desktop) remote, not localhost, but same symptoms!
They recover with: sudo service cups-browsed restart
I may not have waited long enough for the 16.04VM to get entries in /var/log/syslog but the others have several per hour of this:
May 6 06:40:42 ubs3 systemd[1]: Started CUPS Scheduler.
Not sure if this is a clue or normal.
/var/log/cups has nothing helpful either.
I also suspect it’s unique to 16.04 but I may not have waited long enough in my 17.04 VM.
I’m no expert on either cups or systemd and may not have a lot of time today. Just wanted to let you know you’re not alone. Those not seeing it may not be persistent enough - it comes and goes when it wants to.
Here’s hoping this helps someone with some ideas.
EDIT: This looks like it to me and the last post is pretty recent:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1598300