[X2Go-User] CUPS-X2GO Local Printer /usr/lib/cups/backend/cups-x2go failed

[Madog]

Hi All:

I'm getting a printing error in an x2go instance that has worked for a 
long time, and am hoping to get some help.  The error that shows up in 
the client side (windows) print window is:

CUPS-X2GO Local Printer /usr/lib/cups/backend/cups-x2go failed

The server where I'm running x2go ran out of disk space before a fix got 
done, and am wondering if that munged a key or set of files, as am 
guessing this is something to do with printing authentication (it's a 
single node x2go server and x2go printing).

I've tried re-installing the x2go printing (cups-x2go, 
x2goserver-printing).  I've copied in a "cupsd.conf" from another 
working instance.

The /var/log/cups/error_log says:

W [11/Apr/2016:12:15:14 +0000] Please move "SystemGroup lpadmin" on line 
3 of /etc/cups/cupsd.conf to the /etc/cups/cups-files.conf file; this 
will become an error in a future release.
W [11/Apr/2016:12:15:14 +0000] No limit for Validate-Job defined in 
policy default and no suitable template found.
W [11/Apr/2016:12:15:14 +0000] No limit for Cancel-Jobs defined in 
policy default - using Pause-Printer's policy.
W [11/Apr/2016:12:15:14 +0000] No limit for Cancel-My-Jobs defined in 
policy default - using Send-Document's policy.
W [11/Apr/2016:12:15:14 +0000] No limit for Close-Job defined in policy 
default - using Send-Document's policy.
W [11/Apr/2016:12:15:14 +0000] No JobPrivateAccess defined in policy 
default - using defaults.
W [11/Apr/2016:12:15:14 +0000] No JobPrivateValues defined in policy 
default - using defaults.
W [11/Apr/2016:12:15:14 +0000] No SubscriptionPrivateAccess defined in 
policy default - using defaults.
W [11/Apr/2016:12:15:14 +0000] No SubscriptionPrivateValues defined in 
policy default - using defaults.
W [11/Apr/2016:12:15:14 +0000] No limit for Validate-Job defined in 
policy authenticated - using Print-Job's policy.
W [11/Apr/2016:12:15:14 +0000] No limit for Cancel-Jobs defined in 
policy authenticated - using Pause-Printer's policy.
W [11/Apr/2016:12:15:14 +0000] No limit for Cancel-My-Jobs defined in 
policy authenticated - using Send-Document's policy.
W [11/Apr/2016:12:15:14 +0000] No limit for Close-Job defined in policy 
authenticated - using Send-Document's policy.
W [11/Apr/2016:12:15:14 +0000] No JobPrivateAccess defined in policy 
authenticated - using defaults.
W [11/Apr/2016:12:15:14 +0000] No JobPrivateValues defined in policy 
authenticated - using defaults.
W [11/Apr/2016:12:15:14 +0000] No SubscriptionPrivateAccess defined in 
policy authenticated - using defaults.
W [11/Apr/2016:12:15:14 +0000] No SubscriptionPrivateValues defined in 
policy authenticated - using defaults.
E [11/Apr/2016:12:15:14 +0000] Unable to open listen socket for address 
[v1.::1]:631 - Address family not supported by protocol.

I can remove all the x2go packages and reinstall, but am unsure if that 
will address the problem (have not yet tried "Please move "SystemGroup 
lpadmin" on line 3 of /etc/cups/cupsd.conf to the 
/etc/cups/cups-files.conf file" because printing is working in other 
x2go instances).  Any help appreciated...

Thanks!