/usr/lib/x86_64-linux-gnu/libgo.so.4 is in libgo4 4.8.4-2ubuntu1~14.04.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgo.so.4.0.0
/usr/lib/x86_64-linux-gnu/libgo.so.4.0.0