/usr/share/doc/krb5-user/README.gz is in krb5-user 1.12+dfsg-2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/krb5-user/../libkrb5-3/README.gz
/usr/share/doc/krb5-user/../libkrb5-3/README.gz