Les travaux d'impression CUPS sur le serveur Ubuntu 16.04 sont reçus et "réussis", mais l'impression n'a pas lieu.

Je travaille à la mise en place d'un serveur local, dont une partie sera un serveur d'impression CUPS utilisant un HP LaserJet 1018.

J'ai pu configurer CUPS et le faire fonctionner, et j'ai pu installer l'imprimante sans problème.

Cependant, lorsque j'imprime une tâche, elle est reçue et semble réussie, mais rien n'est réellement imprimé.

Voici le contenu de /var/log/cups/error_log :

$ cat /var/log/cups/error_log 
E [03/Jul/2016:17:36:24 -0400] [cups-deviced] PID 11834 (gutenprint52+usb) stopped with status 1!
W [03/Jul/2016:17:42:23 -0400] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_LaserJet_1018-Gray..\' already exists
W [03/Jul/2016:17:53:05 -0400] Notifier for subscription 2 (dbus://) went away, retrying!
E [03/Jul/2016:17:54:25 -0400] [cups-deviced] PID 21003 (gutenprint52+usb) stopped with status 1!
E [03/Jul/2016:17:54:32 -0400] [cups-deviced] PID 21031 (gutenprint52+usb) stopped with status 1!
W [03/Jul/2016:17:54:48 -0400] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_LaserJet_1018-Gray..\' already exists
W [03/Jul/2016:17:54:54 -0400] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_LaserJet_1018-Gray..\' already exists
E [03/Jul/2016:18:02:17 -0400] [cups-deviced] PID 21389 (gutenprint52+usb) stopped with status 1!
W [03/Jul/2016:18:02:36 -0400] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_LaserJet_1018-Gray..\' already exists
W [03/Jul/2016:18:02:46 -0400] CreateProfile failed: org.freedesktop.ColorManager.AlreadyExists:profile id \'HP_LaserJet_1018-Gray..\' already exists

et certains de /var/log/cups/access_log :

localhost - - [03/Jul/2016:18:02:36 -0400] "POST /admin/ HTTP/1.1" 401 353 CUPS-Add-Modify-Printer successful-ok
localhost - cactus [03/Jul/2016:18:02:36 -0400] "POST /admin/ HTTP/1.1" 200 353 CUPS-Add-Modify-Printer successful-ok
192.168.0.106 - cactus [03/Jul/2016:18:02:36 -0400] "POST /admin HTTP/1.1" 200 14525 - -
192.168.0.106 - cactus [03/Jul/2016:18:02:46 -0400] "POST /admin HTTP/1.1" 200 409 - -
localhost - - [03/Jul/2016:18:02:46 -0400] "POST /admin/ HTTP/1.1" 401 24541 CUPS-Add-Modify-Printer successful-ok
localhost - cactus [03/Jul/2016:18:02:46 -0400] "POST /admin/ HTTP/1.1" 200 24541 CUPS-Add-Modify-Printer successful-ok
192.168.0.106 - cactus [03/Jul/2016:18:02:46 -0400] "POST /admin HTTP/1.1" 200 2425 - -
localhost - - [03/Jul/2016:18:03:00 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 423 Print-Job successful-ok
192.168.0.106 - - [03/Jul/2016:18:03:41 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 394 Validate-Job successful-ok
192.168.0.106 - - [03/Jul/2016:18:03:41 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 343 Create-Job successful-ok
192.168.0.106 - - [03/Jul/2016:18:03:41 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 440 Send-Document successful-ok
192.168.0.106 - - [03/Jul/2016:18:08:57 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 469 Validate-Job successful-ok
192.168.0.106 - - [03/Jul/2016:18:08:57 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 434 Create-Job successful-ok
192.168.0.106 - - [03/Jul/2016:18:08:57 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 80371 Send-Document successful-ok
localhost - - [03/Jul/2016:18:09:03 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 227 Create-Job successful-ok
localhost - - [03/Jul/2016:18:09:03 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 281 Send-Document successful-ok
localhost - - [03/Jul/2016:18:09:16 -0400] "POST /printers/HP_LaserJet_1018 HTTP/1.1" 200 423 Print-Job successful-ok

et une capture d'écran de la page CUPS des emplois :

Comment puis-je faire en sorte que le serveur imprime réellement les pages ?