Comment 4 for bug 1438494

The update-gsfontmap is indeed run in a post-install script, in the one of the ghostscript package. It should get run on every change in the directories /etc/ghostscript/cidfmap.d/ and /etc/ghostscript/fontmap.d/ as other packages than ghostscript, for example font packages, could drop files here. Indeed the files in /etc/ghostscript/cidfmap.d/ come from the poppler-data package. I could not determine which package(s) hold the actal fonts though.