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/usr/share/texmf/ is in luatex 0.76.0-3ubuntu1.

This file is owned by root:root, with mode 0o755.

File Mime Type Owner Mode Size
..
/usr/share/texmf/doc/ root:root 0o755
/usr/share/texmf/doc/luatex/ root:root 0o755
/usr/share/texmf/doc/luatex/base/ root:root 0o755
/usr/share/texmf/doc/luatex/base/functionref.pdf root:root 0o777
/usr/share/texmf/doc/luatex/base/luatexref-t.pdf root:root 0o777