Cannot print to (Airport Extreme) networked printer via Avahi

[Sparhawk]

Since upgrading to (K)ubuntu 13.10, I could not print to my Airport Extreme networked printer any more, using the identical settings that worked fine in 13.04.

I can re-add the printer, and it is automatically discovered correctly. However, when I attempted to print to this "new" printer or the "old" printer, the job never completed, with "The printer is not responding". Printing to other network printers worked fine (also via Avahi names).

Alternatively, I can add the printer using the IP address, i.e. as "socket://<ip address of Airport Extreme>:9100", and this works fine.

For the failed Avahi case, I enabled more logging, and will attach `/var/log/cups/error_log`.

Brother HL-2040, Kubuntu 13.10 (KDE 4.11.2)

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: cups 1.7.0~rc1-0ubuntu5
ProcVersionSignature: Error: [Errno 2] No such file or directory: '/proc/version_signature'
Uname: Linux 3.11.8-031108-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Thu Nov 14 20:42:56 2013
InstallationDate: Installed on 2012-12-16 (333 days ago)
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
MachineType: Dell Inc. Dell System XPS L702X
MarkForUpload: True
Papersize: a4
PpdFiles:
 Bio21_colour: Xerox DocuPrint C55 Foomatic/Postscript (recommended)
 Bio21_level_3: Xerox DocuPrint C55 Foomatic/Postscript (recommended)
 McFadden_lab: HP LaserJet 2420 Postscript (recommended)
 Brother_HL-2040: Brother HL-2040 Foomatic/hl1250 (recommended)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.8-031108-generic root=UUID=db0afad2-4157-4cef-adb5-4da2aa4243f0 ro
SourcePackage: cups
UpgradeStatus: Upgraded to saucy on 2013-10-18 (27 days ago)
dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 0XN71K
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.cups.cupsd.conf: [inaccessible: [Errno 13] Permission denied: '/etc/cups/cupsd.conf']

[Sparhawk (sparhawkthesecond)]

/var/log/cups/error_log attached. N.B. my Airport Express is named "Tom".

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Till Kamppeter (till-kamppeter)]

CUPS seems to do everything correctly, so there is possibly an Avahi problem. Added Avahi task.