Debian: regenerate SSH keys
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To regenerate the OpenSSH server keys on a debian system (especially
useful after cloning a VM template), just remove them and
reconfigure the package::

    rm /etc/ssh/ssh_host_*
    dpkg-reconfigure openssh-server

Then, of course, remember to delete the old key from the ``known_hosts``
of any client that already connected to this machine before key regeneration.