/usr/lib/x86_64-linux-gnu/libgettextpo.so is in libgettextpo-dev 0.19.7-2ubuntu3.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgettextpo.so.0.5.3
/usr/lib/x86_64-linux-gnu/libgettextpo.so.0.5.3