/usr/lib/opendbx/libmysqlbackend.so is in libopendbx1-mysql 1.4.6-11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/opendbx/libmysqlbackend.so.1.2.0
/usr/lib/opendbx/libmysqlbackend.so.1.2.0