cups printing not working

[EliCoten]

A couple of days ago CUPS stopped working.

Now if I try to print, no printers show in the list of available printers. If I open the Printers window (system-config-printer) all I get is a message that says "Printing service not available. Start the service on this computer or connect to another server."

The start service button is greyed out. If I click connect and try to connect to localhost I get an error "There was an error during the CUPS operation: 'failed to connect to server'."

I tried sudo service cups start but it didn't help. I'm not sure what happened recently that could have caused this - perhaps an update to one of the packages but it has been working since I upgraded to 14.10 so it's not directly due to the system upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: cups 1.7.5-3ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CupsErrorLog:

CurrentDesktop: Unity
Date: Tue Jan 6 12:45:20 2015
Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: Bad file descriptor
MachineType: System manufacturer System Product Name
Papersize: a4
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=ce77188b-016d-42c7-9d3e-b46ecec2c70e ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: Upgraded to utopic on 2014-12-30 (7 days ago)
dmi.bios.date: 10/10/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0803
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8B75-M LX
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0803:bd10/10/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8B75-MLX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[EliCoten (launchpad-elicoten)]

I'm not sure why this happened but the cause and solution are here: http://askubuntu.com/q/574420/38137

[xzu (xzurukneg)]

"Invalid"?
Two years latter this bug is already here and nobody answer?