/usr/share/man/man1/dot2gxl.1.gz is in graphviz 2.36.0-0ubuntu3.1.
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