Never mind, I found the solution(s)
For future reference:
1. To solve no devices found in hp-setup I needed to edit
/usr/share/hplip/data/models/models.dat like described in
https://answers.launchpad.net/hplip/+question/694898 and
https://bugs.launchpad.net/hplip/+bug/1907444
That enabled me to
I forgot to execute one test last time: LO writer -> PDF -> Okular -> printer
(all local).
I think this prints 100% CMY black, instead of 100% K, but it's totally
acceptable compared with the blue of LO -> printer.
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Some more testing:
Printing black text in Inkscape comes out as pitch black. Printing a pdf with
black text, generated in LibreOffice Writer (different computer, same version
of LO) prints as black.
A pdf generated on the failing system using LO writer, prints pitch
black on another
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It seems that your bug report is not filed about a
specific source package though, rather it is just filed against Ubuntu
in general. It is important that bug reports be filed about source
packages so that people
