title: Duplicati cannot backup to SSH on Debian after remote server update (Algorithm negotiation fail)
body: <p>This issue may be relevant for other Duplicati users:</p>
  
  <p>Duplicati is configured to backup via SSH on a Debian webserver. After this webserver was updated, the backup failed with the error message "Algorithm negotiation fail".</p>
  
  <p>SFTP via FileZilla is still possible, using the same credentials.</p>