I recently had trouble printing on a networked printer at work, where we use 'Papercut' to share printers -- basically you submit your job, give your credentials, then run over to a printer and release the job.
Anyway, I suddenly had issues printing:
I'm not entirely sure what fixed it, but here's what I did
lpstat showed a number of jobs that had been submitted to the printer, but couldn't be released:
me@beryllium:~/Downloads$ lpstat
global-mfp-1166 me 591872 Mon 11 Nov 2013 12:36:29 EST
global-mfp-1167 me 993280 Mon 11 Nov 2013 12:36:44 EST
global-mfp-1168 me 2014208 Mon 11 Nov 2013 12:36:59 EST
global-mfp-1169 me 871424 Mon 11 Nov 2013 12:37:17 EST
global-mfp-1170 me 573440 Mon 11 Nov 2013 12:37:31 EST
global-mfp-1171 me 1199104 Mon 11 Nov 2013 12:37:51 EST
global-mfp-1172 me 183296 Mon 11 Nov 2013 12:38:02 EST
global-mfp-1173 me 491520 Mon 11 Nov 2013 12:38:19 EST
global-mfp-1174 me 2035712 Mon 11 Nov 2013 12:38:38 EST
global-mfp-1175 me 2035712 Mon 11 Nov 2013 12:39:54 EST
global-mfp-1176 me 635904 Mon 11 Nov 2013 12:41:54 EST
global-mfp-1177 me 148480 Mon 11 Nov 2013 16:29:58 EST
I preceded to cancel all the jobs:
me@beryllium:~/Downloads$ cancel global-mfp-1166
me@beryllium:~/Downloads$ lpstat
global-mfp-1167 me 993280 Mon 11 Nov 2013 12:36:44 EST
global-mfp-1168 me 2014208 Mon 11 Nov 2013 12:36:59 EST
global-mfp-1169 me 871424 Mon 11 Nov 2013 12:37:17 EST
global-mfp-1170 me 573440 Mon 11 Nov 2013 12:37:31 EST
global-mfp-1171 me 1199104 Mon 11 Nov 2013 12:37:51 EST
global-mfp-1172 me 183296 Mon 11 Nov 2013 12:38:02 EST
global-mfp-1173 me 491520 Mon 11 Nov 2013 12:38:19 EST
global-mfp-1174 me 2035712 Mon 11 Nov 2013 12:38:38 EST
global-mfp-1175 me 2035712 Mon 11 Nov 2013 12:39:54 EST
global-mfp-1176 me 635904 Mon 11 Nov 2013 12:41:54 EST
global-mfp-1177 me 148480 Mon 11 Nov 2013 16:29:58 EST
me@beryllium:~/Downloads$ cancel global-mfp-1167
me@beryllium:~/Downloads$ cancel global-mfp-1168
me@beryllium:~/Downloads$ cancel global-mfp-1169
me@beryllium:~/Downloads$ cancel global-mfp-1170
me@beryllium:~/Downloads$ cancel global-mfp-1171
me@beryllium:~/Downloads$ cancel global-mfp-1172
me@beryllium:~/Downloads$ cancel global-mfp-1173
me@beryllium:~/Downloads$ cancel global-mfp-1174
me@beryllium:~/Downloads$ cancel global-mfp-1175
me@beryllium:~/Downloads$ cancel global-mfp-1176
me@beryllium:~/Downloads$ cancel global-mfp-1177
me@beryllium:~/Downloads$ lpstat
me@beryllium:~/Downloads$
That didn't remove the error message, however. Opening Printers in Gnome(3) showed that the printer with an issues was set to 'off'. Unlocking and changing it to 'on' resolved the issue.