upgraded virtual server -> No ssh/scp

[pixartist2]

I upgraded by doing:
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install update-manager-core
$ sudo do-release-upgrade

And now I can't get a ssh or scp connection! The damn provider support won't help me because they don't support any more recent version of ubuntu than 8.04. (which is too old for what I need :( )

So any Idea how I can get the ssh daemon running again ? I have access to a PLESK control panel -> I can modify files, start services and restart the server.

Thanks

[pixartist2]

I managed to get an ssh connection by starting in repair mode, can someone gimme a hint how I can get ssh to work in normal mode again ?