/usr/lib/x86_64-linux-gnu/libsimage.so.20 is in libsimage20 1.7.1~2c958a6.dfsg-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsimage.so.20.7.1
/usr/lib/x86_64-linux-gnu/libsimage.so.20.7.1