/usr/share/man/man1/cg3.1.gz is in cg3 0.9.9~r10793-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/vislcg3.1.gz
/usr/share/man/man1/vislcg3.1.gz