/usr/lib/llvm-6.0/bin/lldb-server-6.0.0 is in lldb-6.0 1:6.0-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/llvm-6.0/bin/lldb-server
/usr/lib/llvm-6.0/bin/lldb-server