/usr/share/man/man1/gxl2dot.1.gz is in graphviz 2.26.3-10ubuntu1.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/gxl2gv.1.gz
/usr/share/man/man1/gxl2gv.1.gz