/usr/lib/x86_64-linux-gnu/libotcl.so is in libotcl1-dev 1.14+dfsg-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libotcl.so.1
/usr/lib/x86_64-linux-gnu/libotcl.so.1