/usr/share/info/gnutls-pgp.png is in gnutls-doc 3.0.11+really2.12.14-5ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/info/../doc/gnutls-doc/html/gnutls-pgp.png
/usr/share/info/../doc/gnutls-doc/html/gnutls-pgp.png