/usr/share/man/man8/gfs2_fsck.8.gz is in gfs2-utils 3.1.9-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man8/fsck.gfs2.8.gz
/usr/share/man/man8/fsck.gfs2.8.gz