/usr/lib/libdruntime-ldc.so.68 is in libphobos2-ldc68 1:0.17.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libdruntime-ldc.so.2.0.68
/usr/lib/libdruntime-ldc.so.2.0.68