/usr/share/doc/oar-user/changelog.Debian.gz is in oar-user 2.5.2-4.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/oar-user/../oar-common/changelog.Debian.gz
/usr/share/doc/oar-user/../oar-common/changelog.Debian.gz