Hi, I've got the same problem with Ubuntu 16.04, where DSS can't be enabled anymore. I've already tried the instructions from this post: http://www.ks-soft.net/cgi-bin/phpBB/viewtopic.php?t=7813&highlight=protocol+error and also the link: http://www.jbytechnologies.com/linux/sshd-add-dsa-key.htm...