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On attempt to access cups user interface at localhost:631/admin (or others) firefox gives "unable to connect". When i'm launching netstat i see no cups demon listening to port 631. Please help me to determine the problem.

Also here are errors from /var/logs/cups/error.log:

W [22/Jul/2016:12:23:28 +0300] Duplicate listen address "/var/run/cups/cups.sock" ignored.
E [22/Jul/2016:12:23:28 +0300] Unknown directive JobPrivateAccess on line 84 of /etc/cups/cupsd.conf.
E [22/Jul/2016:12:23:28 +0300] Unknown directive JobPrivateValues on line 85 of /etc/cups/cupsd.conf.
E [22/Jul/2016:12:23:28 +0300] Unknown directive SubscriptionPrivateAccess on line 86 of /etc/cups/cupsd.conf.
E [22/Jul/2016:12:23:28 +0300] Unknown directive SubscriptionPrivateValues on line 87 of /etc/cups/cupsd.conf.
E [22/Jul/2016:12:23:28 +0300] MF3010: File "/usr/lib/cups/filter/pstoufr2cpca" not available: No such file or directory
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I just had the same problem, and I was able to solve it by renaming /etc/cups/cupsd.conf to /etc/cups/cupsd.conf.busted, and then running dpkg-reconfigure cups-daemon, which recreates cupsd.conf from scratch.

I have no idea what the cause of the problem was, and the freshly generated cupsd.conf bears no resemblance to the old file, so that doesn't help any. But hopefully this will at least get some people unstuck.

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