/usr/lib/x86_64-linux-gnu/libecpg.so.6 is in libecpg6 9.5.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libecpg.so.6.7
/usr/lib/x86_64-linux-gnu/libecpg.so.6.7