/usr/lib/x86_64-linux-gnu/libubuntu-app-launch.so is in libubuntu-app-launch2-dev 0.5+15.10.20150817-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libubuntu-app-launch.so.2