** Description changed:

+ [Impact]
+ 
+ The problem occurs when the printer's driver package is updated and with
+ this the PPD is replaced and one of the default settings of the queue is
+ not available any more in the new PPD file. Then the setting is prefixed
+ with "Custom." and with this the jobs fail.
+ 
+ See comment #15 for more info.
+ 
+ [Test Case]
+ 
+ - Create a print queue with a PPD.
+ - evince an arbitrary PDF file
+ - Click the print icon
+ - In the print dialog choose the newly created queue and choose some uncommon 
paper size (not custom). Click "Print".
+ - Check /var/log/cups/error_log, the page size gets correctly received.
+ - Close evince.
+ - Stop CUPS, edit the PPD file removing the paper size you have selected for 
your job in the PageSize, PageRegion, PaperDimension, and ImageableArea lines.
+ - Start CUPS.
+ - Open the same PDF file again with evince, click Print and then select 
"Print" in the print dialog without changing anything.
+ - The job fails, in /var/log/cups/error_log you see that the page size is 
prefixed with "Custom.".
+ 
+ With the fixed package installed the job will print.
+ 
+ [Regression Potential]
+ 
+ The change applies only to saved settings of the print dialog not
+ matching with any of the settings available in the PPD file. In rare
+ cases the fix could fail by mis-understanding the setting and this way
+ not being effective. For options which do not support setting custom
+ values (the vast majority) the patch should always prevent a job failure
+ though.
+ 
+ [Other Info]
+ 
+ Complete info about the bug and the fix in comment #15,
+ 
+ Original bug description:
+ 
  I am unable to print to my network-attached printer after upgrade to
  bionic.  ps shows:
  
  lp       26047  0.0  0.0  91668  5756 ?        S    15:06   0:00  \_ 
HP-ENVY-4500-new 473 vorlon USCIS Form I-9 1 print-content-optimize=auto 
print-rendering-intent=auto cupsPrintQuality=4 number-up=1 MediaType=Stationery 
noCollate print-scaling=auto PageSize=Custom.Letter.SM ColorModel=RGB 
Duplex=DuplexNoTumble job-uuid=urn:uuid:08c937ec-ccb6-3ff1-6ed4-212128e4257b 
job-originating-host-name=localhost date-time-at-creation= 
date-time-at-processing= time-at-creation=1523570792 
time-at-processing=1523570792 print-quality=4
  lp       26050  0.1  0.0      0     0 ?        Z    15:06   0:00  |   \_ [gs] 
<defunct>
  lp       26048  0.0  0.0  79908  3836 ?        S    15:06   0:00  \_ 
HP-ENVY-4500-new 473 vorlon USCIS Form I-9 1 print-content-optimize=auto 
print-rendering-intent=auto cupsPrintQuality=4 number-up=1 MediaType=Stationery 
noCollate print-scaling=auto PageSize=Custom.Letter.SM ColorModel=RGB 
Duplex=DuplexNoTumble job-uuid=urn:uuid:08c937ec-ccb6-3ff1-6ed4-212128e4257b 
job-originating-host-name=localhost date-time-at-creation= 
date-time-at-processing= time-at-creation=1523570792 
time-at-processing=1523570792 print-quality=4
  root     26049  0.0  0.0  84388  6192 ?        S    15:06   0:00  \_ 
ipp://HP645106EA160E.local:631/ipp/print 473 vorlon USCIS Form I-9 1 
print-content-optimize=auto print-rendering-intent=auto cupsPrintQuality=4 
number-up=1 MediaType=Stationery noCollate print-scaling=auto 
PageSize=Custom.Letter.SM ColorModel=RGB Duplex=DuplexNoTumble 
job-uuid=urn:uuid:08c937ec-ccb6-3ff1-6ed4-212128e4257b 
job-originating-host-name=localhost date-time-at-creation= 
date-time-at-processing= time-at-creation=1523570792 
time-at-processing=1523570792 print-quality=4
  
  Note the un-reaped gs process.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: cups 2.2.7-1ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 12 15:07:49 2018
  InstallationDate: Installed on 2010-09-24 (2757 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  MachineType: LENOVO 2306CTO
  Papersize: letter
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed 
root=/dev/mapper/hostname-root ro quiet splash vt.handoff=1
  SourcePackage: cups
  UpgradeStatus: Upgraded to bionic on 2018-03-21 (21 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET97WW (2.57 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad X230
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO
  modified.conffile..etc.cups.cupsd.conf: [inaccessible: [Errno 13] Permission 
denied: '/etc/cups/cupsd.conf']

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https://bugs.launchpad.net/bugs/1763520

Title:
  after upgrade to bionic, printing fails without explanation / logs /
  debuggability

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