Hi! _Maybe_ this could help a little.
My computer crashed (due to a power supply problem) and after restarting it, everything got back to normal again (I was able to open urxvt and use terminus-12). Today, xfonts-terminus was updated from 4.40-1 to 4.40-2 and I saw the same problem one more time: urxvt was unable to find and use terminus. Manually running "xset fp rehash" got things back to normal. I couldn't spot anything wrong when setting -x and removing "2>/dev/null || true" from postinst: + [ configure = configure -a -n :0 ] + xset fp rehash + which update-fonts-dir + update-fonts-dir --x11r7-layout misc + update-fonts-alias --include /etc/X11/fonts/misc/xfonts-terminus.alias misc + exit 0 If I reinstall xfonts-terminus I can reproduce this problem (so I could try to test something if needed).