/usr/lib/libdesktop-agnostic.so.0 is in libdesktop-agnostic0 0.3.92+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libdesktop-agnostic.so.0.4.0
/usr/lib/libdesktop-agnostic.so.0.4.0