/usr/bin/lldb-server-3.7 is in lldb-3.7 1:3.7.1-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/llvm-3.7/bin/lldb-server
/usr/bin/../lib/llvm-3.7/bin/lldb-server