/usr/share/doc/libapol4/KNOWN-BUGS.gz is in libapol4 3.3.6.ds-7.2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libapol4/../libqpol1/KNOWN-BUGS.gz
/usr/share/doc/libapol4/../libqpol1/KNOWN-BUGS.gz