/usr/share/doc/libsmartcardpp1-dbg/changelog.Debian.gz is in libsmartcardpp1-dbg 0.3.0-0ubuntu6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libsmartcardpp1-dbg/../libsmartcardpp1/changelog.Debian.gz