/usr/lib/libguile-ltdl.so.1 is in libguile-ltdl-1 1.6.8-10ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libguile-ltdl.so.1.0.1
/usr/lib/libguile-ltdl.so.1.0.1