/usr/share/doc/libitsol-dev/changelog.Debian.gz is in libitsol-dev 1.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libitsol-dev/../libitsol1/changelog.Debian.gz
/usr/share/doc/libitsol-dev/../libitsol1/changelog.Debian.gz