Public bug reported:
Upgrading to a new release is often done with do-release-upgrade. If you
do this via SSH, this probably runs in a dedicated "screen" session. At
some point you might be asked to replace your current "sshd_config" with
the package maintainer's one. While sitting at this prompt, you can't
open a new SSH connection to your machine.
If you let the upgrade run in the background from a remote pc, you might
lose connection in the meantime. If the upgrade reaches this prompt, you
will not be able to log in and resume your upgrade with SSH, as sshd
won't accept connections. The port is opened and you can connect, but
sshd will immediately close the connection, without even prompting for
credentials.
If you have no other means but SSH to access your server (e.g. headless
vps), you won't be able to login again and might be forced to a
reinstallation (or some other form of recovery operation).
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: do-release-upgrade ssh sshd upgrade
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https://bugs.launchpad.net/bugs/1880409
Title:
Prompting for change to sshd_config might cause lock-out from upgrade
process
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