/usr/share/doc/libpocoodbc9-dbg/changelog.Debian.gz is in libpocoodbc9-dbg 1.3.6p1-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpocoodbc9-dbg/../libpocoodbc9/changelog.Debian.gz