Thanks for the tip!
When I just tried that I got:

# sudo apt install ghostscript=9.25~dfsg+1-0ubuntu1
libgs9=9.25~dfsg+1-0ubuntu1 libgs9-common=9.25~dfsg+1-0ubuntu1
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Version '9.25~dfsg+1-0ubuntu1' for 'ghostscript' was not found
E: Version '9.25~dfsg+1-0ubuntu1' for 'libgs9' was not found
E: Version '9.25~dfsg+1-0ubuntu1' for 'libgs9-common' was not found
#

Obviously I need to configure(?) something, but am at a bit of a loss
as to what,
as I don't really know much about the Debian/Ubuntu packaging system.  (Any
tips or pointers?)

Fortunately, the "High Qualify Grayscale" CUPS workaround is Ok(-ish)
for now....

cheers!
     -blf-

On Fri, 22 Feb 2019 at 18:20, Jarl <1817...@bugs.launchpad.net> wrote:
> I have downgraded to 9.25 using
> sudo apt install ghostscript=9.25~dfsg+1-0ubuntu1 libgs9=9.25~dfsg+1-0ubuntu1 
> libgs9-common=9.25~dfsg+1-0ubuntu1
>
> That solved the problem.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1817308
>
> Title:
>   GhostScript Update causes Blue Background
>
> Status in ghostscript package in Ubuntu:
>   Incomplete
>
> Bug description:
>   I am running 64 bit Linux Mint 19.1, the Cinnamon desktop 4.0.9, with
>   kernel 4.15.0-45-generic.
>
>   Two days ago an update to ghostscript dated 20 FEB 2019 appeared, and
>   was applied to two of my machines (One is an Intel and one is an AMD,
>   but both are kept fully updated) that share a networked HP OfficeJet
>   6700 Printer.
>
>   At some point following the update, I happened to print a document,
>   and ended up with a blue background on every page, even otherwise
>   blank second sides. This occured regardless of a variety of
>   originating applications I used, such as LibreOffice, various text
>   editors, and even the CUPS "print test page" option.
>
>   It took me a while to troubleshoot this on that first machine (trying
>   different apps, reinstalling CUPS and so forth) until I realized the
>   new ghostscript update was the issue and that (after trying to print
>   from the second machine) it was affecting both machines.
>
>   I should note that, using the "non-CUPS" appearance of the same
>   printer, no blue background is present, but of course this provides no
>   features like ink-level reporting, dual-sided printing, etc.
>
>   I "restored" the ghostscript stuff from the last Timeshift backup and
>   that cured the issue but I think this is a serious matter that should
>   be addressed immediately (not the least because it's hard to read
>   black text on a blue background and it wastes a lot of ink).
>
>   I first posted this at
>   <https://forums.linuxmint.com/viewtopic.php?f=47&t=288613#p1598888>
>   and then sent an e-mail to marc.deslauri...@ubuntu.com (whose name was
>   on the update information) who advised me to post this bug here.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/ghostscript/+bug/1817308/+subscriptions


-- 
“How many surrealists does it take to    |  Brian Foster
 change a lightbulb?  Three.  One calms  |  somewhere in south of France
 the warthog, and two fill the bathtub   |
 with brightly-coloured machine tools.”  |

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1817308

Title:
  GhostScript Update causes Blue Background

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