/usr/lib/x86_64-linux-gnu/libethumb.so.1 is in libethumb1 1.8.6-2.5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libethumb.so.1.8.6
/usr/lib/x86_64-linux-gnu/libethumb.so.1.8.6