/usr/lib/x86_64-linux-gnu/libXpm.so.4 is in libxpm4 1:3.5.11-1ubuntu0.16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libXpm.so.4.11.0
/usr/lib/x86_64-linux-gnu/libXpm.so.4.11.0