/usr/share/doc/lmodern/README-Latin-Modern.txt is in lmodern 2.004.5-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/lmodern/../../texmf/doc/fonts/lm/README-Latin-Modern.TXT
/usr/share/doc/lmodern/../../texmf/doc/fonts/lm/README-Latin-Modern.TXT