/usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0 is in libpulse-mainloop-glib0 1:1.1-0ubuntu15.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpulse-mainloop-glib.so.0.0.4