/usr/share/texmf/fonts/source/ is in ptex-base 1:2.5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/texmf/fonts/source/ascgrp/
/usr/share/texmf/fonts/source/ascgrp/ascgrp.mf
/usr/share/texmf/fonts/source/ascgrp/ascii.mf
/usr/share/texmf/fonts/source/ascgrp/ascii10.mf
/usr/share/texmf/fonts/source/ascgrp/ascii36.mf
/usr/share/texmf/fonts/source/ptex/
/usr/share/texmf/fonts/source/ptex/goth10.pl
/usr/share/texmf/fonts/source/ptex/goth5.pl
/usr/share/texmf/fonts/source/ptex/goth6.pl
/usr/share/texmf/fonts/source/ptex/goth7.pl
/usr/share/texmf/fonts/source/ptex/goth8.pl
/usr/share/texmf/fonts/source/ptex/goth9.pl
/usr/share/texmf/fonts/source/ptex/min10.pl
/usr/share/texmf/fonts/source/ptex/min5.pl
/usr/share/texmf/fonts/source/ptex/min6.pl
/usr/share/texmf/fonts/source/ptex/min7.pl
/usr/share/texmf/fonts/source/ptex/min8.pl
/usr/share/texmf/fonts/source/ptex/min9.pl
/usr/share/texmf/fonts/source/ptex/ngoth10.pl
/usr/share/texmf/fonts/source/ptex/ngoth5.pl
/usr/share/texmf/fonts/source/ptex/ngoth6.pl
/usr/share/texmf/fonts/source/ptex/ngoth7.pl
/usr/share/texmf/fonts/source/ptex/ngoth8.pl
/usr/share/texmf/fonts/source/ptex/ngoth9.pl
/usr/share/texmf/fonts/source/ptex/nmin10.pl
/usr/share/texmf/fonts/source/ptex/nmin5.pl
/usr/share/texmf/fonts/source/ptex/nmin6.pl
/usr/share/texmf/fonts/source/ptex/nmin7.pl
/usr/share/texmf/fonts/source/ptex/nmin8.pl
/usr/share/texmf/fonts/source/ptex/nmin9.pl
/usr/share/texmf/fonts/source/ptex/tgoth10.pl
/usr/share/texmf/fonts/source/ptex/tgoth5.pl
/usr/share/texmf/fonts/source/ptex/tgoth6.pl
/usr/share/texmf/fonts/source/ptex/tgoth7.pl
/usr/share/texmf/fonts/source/ptex/tgoth8.pl
/usr/share/texmf/fonts/source/ptex/tgoth9.pl
/usr/share/texmf/fonts/source/ptex/tmin10.pl
/usr/share/texmf/fonts/source/ptex/tmin5.pl
/usr/share/texmf/fonts/source/ptex/tmin6.pl
/usr/share/texmf/fonts/source/ptex/tmin7.pl
/usr/share/texmf/fonts/source/ptex/tmin8.pl
/usr/share/texmf/fonts/source/ptex/tmin9.pl