> focal sshd doesn't answer VX Connectbot.  no idea why.  no problem with
> bionic sshd, even if invoked on the focal kernel.  tried to simply
> substitute bionic /usr/sbin/sshd into focal, wouldn't start.  works in a
> bionic chroot on focal, but from there tunnels don't connect.  i submitted
> a bug <https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1877496>,
> but i'm not holding my breath for a resolution.
>
> so next i thought i'd try to install the bionic openssh-server package in
> focal.  perhaps can be done with dpkg, probably pretty straightforward, but
> not very robust.  what i'm wondering is if there might be a way to specify
> the most recent available bionic version of openssh-server, satisfying
> dependencies from bionic as needed but preferring focal for most of
> everything.  any apt-get experts here?
>

well in focal i added bionic defs into /etc/apt/sources.list and ran
apt-get --auto-remove --purge install openssh-server/bionic
openssh-sftp-server/bionic
which did as asked.  but sshd wouldn't start.  well it was worth a try.
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