/usr/lib/libecpg_compat.so.3 is in libecpg-compat3 9.1.23-0ubuntu0.12.04.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libecpg_compat.so.3.3
/usr/lib/libecpg_compat.so.3.3