/usr/lib/libgwibber-gtk.so is in libgwibber-gtk-dev 3.4.0-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libgwibber-gtk.so.2.0.0
/usr/lib/libgwibber-gtk.so.2.0.0