You are trying to install a package for a different processor architecture (AMD64) on the Pi (which is ARM). All the dependencies you see are AMD64 libraries. Because they are for a different processor, they will not run on the Pi. That is the reason why these dependencies are not in the repository for the Pi, and that they are not installable.
I have tried ...
apt-get remove --purge openssh-server
apt-get install openssh-server
apt-get purge command removes the program package from your system without keeping the configuration files and any plugins and settings.