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> So how do I install the old version next to the new version in ubuntu 34.04?

You would install Nix and run something similar to "nix run nixpkgs-23.11#openssh <address>"

discuss

So, what's currently the oldest version of openssh that you can install this way?

  export LC_ALL=C
  nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/archive/2322899a1fa85f6547004b2829af81e7b444f506.tar.gz -p openssh
  ssh -V
  OpenSSH_6.1p1, OpenSSL 1.0.0i 19 Apr 2012

Note that the first stable release of nixpkgs was in 2013.