/usr/lib/x86_64-linux-gnu/libopen-rte.so.20.10.1 is in libopenmpi2 2.1.1-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/openmpi/lib/libopen-rte.so.20.10.1
/usr/lib/x86_64-linux-gnu/openmpi/lib/libopen-rte.so.20.10.1