Connect to ssh-1 server from recent Ubuntu

[Jeffrey Walton]

On Sun, Jun 29, 2025 at 5:37 PM Liam Proven <lproven at gmail.com> wrote:
>
> Google and Duckduckgo are both drawing blanks. Nothing even related.
>
> A chap on a vintage-computing list wants to connect to a SunOS machine
> (pre-Solaris) with SSH from "recent Ubuntu".
>
> SunOS that old only understands ssh v1. He says that seems not to have
> been available since Ubuntu 10.04.
>
> Is that right? You can't specify older versions of the protocol?

Related, you might find the package openssh-client-ssh1 useful. See
<https://launchpad.net/ubuntu/+source/openssh-ssh1>.

The package is present in Ubuntu 22.04, but I don't know about Ubuntu 24:

    $ apt-cache search openssh-client-ssh1
    openssh-client-ssh1 - secure shell (SSH) client for legacy SSH1 protocol

    $ lsb_release -a | grep Desc
    Description:    Ubuntu 22.04.5 LTS

Jeff