/usr/share/doc/texlive-doc/latex/otibet/otibet-mule.tex is in texlive-lang-tibetan 2009-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/texlive-doc/latex/otibet/../../../texlive-lang-tibetan/latex/otibet/otibet-mule.tex