Marc, I am on Disco and after a system update today I have the following
Ghostscript:

----------
ghostscript (9.26~dfsg+0-0ubuntu5) disco; urgency=medium

  * SECURITY REGRESSION: High RIP_MAX_CACHE makes cups output device fail
    (LP: #1815339)
    - debian/patches/lp1815339.patch: fix logic in cups/gdevcups.c.

 -- Marc Deslauriers <marc.deslauri...@ubuntu.com>  Wed, 20 Feb 2019 10:37:16 
+0100
----------

For me this looks like the buggy version which causes blue backgrounds
on some HP printers.

I by myself could not test it as my HP OfficeJet Pro 8730 uses standard
RGB (1) and not RGBW (17) when using the hpcups driver.

As you have uploaded this Ghostscript version, could you also upload the
one with the final fix to Disco? Thanks.

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https://bugs.launchpad.net/bugs/1815339

Title:
  Printer stopped printing paper size 4"x6" after update ghostscript to
  9.26

Status in GS-GPL:
  Fix Released
Status in ghostscript package in Ubuntu:
  Triaged
Status in ghostscript source package in Trusty:
  Fix Released
Status in ghostscript source package in Xenial:
  Fix Released
Status in ghostscript source package in Bionic:
  Fix Released
Status in ghostscript source package in Cosmic:
  Fix Released
Status in ghostscript source package in Disco:
  Triaged

Bug description:
  
  I have an issue with Ghostscript and printing.
  I use Gutenprint for my Canon MG5440, and I cannot print a photo 4"x6" (or 
6"x4"), it does not print anything, however I still able to print A4 paper size.
  I use Ubuntu 18.04 and Gutenprint 5.3.1.

  The printing fail with message:
  ....
  [Job 143] Start rendering...
  [Job 143] Processing page 1...
  [Job 143] **** Unable to open the initial device, quitting.
  [Job 143] Rendering completed
  ...
  [Job 143] PID 24869 (/usr/lib/cups/filter/gstoraster) stopped with status 1.
  ...
  [Job 143] printer-state-message="Filter failed"
  [Job 143] printer-state-reasons=none

  The message "Unable to open the initial device, quitting" comes from
  Ghostscript.

  
  When I downgrade Ghostscript to 9.22, 
  I am again able to print 4"x6" paper size.

  To downgrade: apt install ghostscript=9.22~dfsg+1-0ubuntu1
  libgs9=9.22~dfsg+1-0ubuntu1 libgs9-common=9.22~dfsg+1-0ubuntu1

  I found similar issue for HP printer at Debian https://bugs.debian.org
  /cgi-bin/bugreport.cgi?bug=908205

  
  System info:
  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  ghostscript:
    Installed: 9.26~dfsg+0-0ubuntu0.18.04.4
    Candidate: 9.26~dfsg+0-0ubuntu0.18.04.4
    Versions:
   *** 9.26~dfsg+0-0ubuntu0.18.04.4 500
          500 http://ua.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       9.22~dfsg+1-0ubuntu1 500
          500 http://ua.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  cups:
    Installed: 2.2.7-1ubuntu2.3
    Candidate: 2.2.7-1ubuntu2.3
    Versions:
   *** 2.2.7-1ubuntu2.3 500
          500 http://ua.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       2.2.7-1ubuntu2.2 500
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
       2.2.7-1ubuntu2 500
          500 http://ua.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

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