/usr/ is in tcl-dev 8.6.0+6ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/tcl-dev/
/usr/share/doc/tcl-dev/copyright
/usr/share/aclocal/
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/tcltk-depends.1.gz
/usr/include/
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/bin/
/usr/bin/tcltk-depends
/usr/share/doc/tcl-dev/README.Debian
/usr/share/doc/tcl-dev/changelog.gz
/usr/share/aclocal/tcl.m4
/usr/include/tcl
/usr/lib/x86_64-linux-gnu/libtclstub.a
/usr/lib/x86_64-linux-gnu/tclConfig.sh
/usr/lib/x86_64-linux-gnu/tclooConfig.sh
/usr/lib/x86_64-linux-gnu/libtcl.a
/usr/lib/x86_64-linux-gnu/libtcl.so
/usr/lib/tclConfig.sh
/usr/lib/tclooConfig.sh