Apologies, Till, for the delayed reply - I *thought* replying on a bug
also subscribed me to it, but clearly not! (I have subscribed now).

There is a bit of guess work here, as I don't fully understand the file
locations.

We are mainly concerned with the cidfmap file. Now, there is a set of
cidfmap files in "/etc/ghostscript/cidfmap.d/" and those (it appears)
are used by the "/usr/sbin/update-gsfontmap" script (poor name, as it
adds to the confusion that Fonts and CIDFonts are the same thing!), to
update the *actual* cidfmap which is in
"/var/lib/ghostscript/fonts/cidfmap". It is not at all clear to me how
the "update-gsfontmap" script gets run - possibly only as a package
post-install step?

The files in "/etc/ghostscript/cidfmap.d/" are as follows (file name +
TTF font(s) referenced):

90gs-cjk-resource-cns1.conf - ukai.ttc, uming.ttc
90gs-cjk-resource-gb1.conf - ukai.ttc, uming.ttc
90gs-cjk-resource-japan1.conf - fonts-japanese-mincho.ttf, 
fonts-japanese-gothic.ttf
90gs-cjk-resource-japan2.conf - ttf-japanese-mincho.ttf, ttf-japanese-gothic.ttf
90gs-cjk-resource-korea1.conf - NanumMyeongjo.ttf, NanumBarunGothic.ttf, 
NanumBarunGothicBold.ttf, NanumGothic.ttf

NOTE: there is some inconsistency (possibly bitrot) there with "fonts-
japanese-*.ttf" used in one file and "ttf-japanese-*.ttf" used in
another - clearly the same font, but likely different "generations" of
name.


My two alternate solutions are that the Ghostscript package should be augmented 
to include the fonts listed above (with the names and paths updated to reflect 
the current directory tree etc) as dependencies, thus they always get installed 
with Ghostscript.

*Or* to split off (I *think*) the files in "/etc/ghostscript/cidfmap.d/"
into something like a "ghostscript-cjk-cidfonts" package, which has
those fonts listed above as dependencies (again with names and paths
revised for a modern system).

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https://bugs.launchpad.net/bugs/1438494

Title:
  ghostscript fails to correctly substitute cidf fonts

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