/usr/lib/x86_64-linux-gnu/libdjvulibre.so is in libdjvulibre-dev 3.5.27.1-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libdjvulibre.so.21.6.0
/usr/lib/x86_64-linux-gnu/libdjvulibre.so.21.6.0