/usr/bin/check-ifupdown-scripts-zg2.d-symlinks is in ifupdown-scripts-zg2 0.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/update-ifupdown-scripts-zg2.d-symlinks
/usr/bin/update-ifupdown-scripts-zg2.d-symlinks