Question regarding OpenSSH server on Ubuntu 16.04 LTS

[Colin Law]

On Fri, 25 Sep 2020 at 10:45, Jonathan Sélea
<jonathan.selea at instantsystems.se> wrote:
>
> Hi,
> Yes, that issue does not even affect  7.2p2-4ubuntu2.8 at all, since they dont build openssh with experimental functions suchs at XMSS.
> Installing the slightly older version should be as simple as this:
> apt-get install openssh-server=xenial-updates 1:7.2p2-4ubuntu2.10

Please insert your reply at appropriate points in the message you are
replying to, that is the convention on this list.  Thanks.

Since you are using ssh to get into the machine I am not going to
recommend how to do it, as I don't have sufficient knowledge to be
absolutely confident.
However, if I were doing it I would first do a dry run
apt-get install --dry-run openssh-server=1:7.2p2-4ubuntu2.10
which will make sure that it is installable, then if ok run it again
without the dry-run.
There is only one matching version so I don't think you need anything
more.  However it is always risky downgrading s/w as compatibility is
not always guaranteed for downgrading.  I would be surprised if there
is a problem, but you need a plan B in case something goes wrong.

Colin