Ubuntu 22.04 compatibility issue?

[mikkokotila]

With Ubuntu 22.04 get

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2022/04/30 14:09:58 ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

With Ubuntu 20.04 everything works just fine. Nothing else changed, just the Ubuntu version change and the result is that ssh-action stops working.

[Syzuna]

yes this seems to be related to openssh 8.8p1-1 and up not accepting ssh-rsa key types by default.
for now you can add "PubkeyAcceptedKeyTypes=+ssh-rsa" to your /etc/ssh/sshd_config.
dont forget to restart the sshd service afterwards with "sudo systemctl restart sshd"