pysftp / paramiko problem

[Robin Becker]

.......

I tried an experiment with a remote server that I control and pysftp works perfectly there. A difference that I know of is that 
this server is using ubuntu 18.04 and we don't use passwords, but a private_key. Also this server is using the openssh internal sftp.

I believe the failing server is using an earlier version of openssh or OS as it wants to use ssh-dss which is now considered 
unsafe  (I believe).
-- 
Robin Becker