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When reading up issues to be aware of for Trixie, specifically interrupted remote upgrades (SSH), caught my eye.

I have one server I wanted to upgrade, to which I do have physical access, so this would just mean to connect screen and stuff.

But, I also manage a VPS server, to which I have no physical access, so I would like to hear how exactly I am to upgrade the OpenSSH packages:

Users planning upgrades to remote systems over an SSH connection are advised to first update OpenSSH to version 1:9.2p1-2+deb12u7 or greater through the stable-updates mechanism.

I suppose, I just do not know much about the upgrades, and I hope it is trivial.

Thanks in advance in any case.

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What this means is that you need to ensure the OpenSSH packages are upgraded to the latest version available in Debian 12, 1:9.2p1-2+deb12u7.

This is currently only available in the “updates” repository, so you need a line such as

deb http://deb.debian.org/debian/ bookworm-updates main

in /etc/apt/sources.list or somewhere in /etc/apt/sources.list.d.

If apt policy openssh-server shows that the installed version is 1:9.2p1-2+deb12u7, then you’re fine. Otherwise, check your repository configuration (if apt policy openssh-server doesn’t show 1:9.2p1-2+deb12u7 as the candidate version), and run apt upgrade (which is a good idea anyway before starting the upgrade to the next release). After upgrading openssh-server, make sure you disconnect and reconnect so your SSH session uses the upgraded daemon.

See bug #1110030 for details.

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