/usr/lib/purple-2/libymsg.so.0 is in libpurple0 1:2.10.12-0ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/purple-2/libymsg.so.0.0.0
/usr/lib/purple-2/libymsg.so.0.0.0