I found the reason. Fonts (not managed by fontconfig, but only by Xserver) are installed under /usr/share/fonts/X11/ (as well as encondings). The /ect/X11/xorg.conf file instead uses as FontPath the path /usr/share/X11/fonts/. In this path there are the usual 100dpi/ 75dpi/ misc/ and Type1/ directories, but they are empty.
Running a 'sudo dpkg-reconfigure -phigh xserver-xorg' can't help :-( -- Unable to load any usable ISO8859 font https://launchpad.net/bugs/63408 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
