/usr/share/man/man1/cg3.1.gz is in cg3 1.0.0~r12254-1ubuntu3.
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