Sometimes happend, that UWS installs directly with root user - this can be not safe (e.g. using pubkeys etc).
- create 2 additional users (user1, user2)
- set in CMD: ubuntu1804 config --default-user user1 (now starting user is user1 instead of root)
- set passwd for user2, under user2 generate ssh keys: ssh-keygen -t rsa / cat .ssh/id_rsa.pub
- import keys to remote servers
- now su, sudo su, su user2 is asking for password