/usr/lib/x86_64-linux-gnu/libgcj_bc.so.1 is in libgcj-bc 6.3.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgcj.so.17
/usr/lib/x86_64-linux-gnu/libgcj.so.17