/usr/lib/x86_64-linux-gnu/libebook-1.2.so is in libebook1.2-dev 3.18.5-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libebook-1.2.so.16.3.1
/usr/lib/x86_64-linux-gnu/libebook-1.2.so.16.3.1