Just installed Ubuntu 24.04 from the server image (https://ubuntu.com/download/server) and was just bitten by this.
Disabling password auth in `/etc/ssh/sshd_config` does nothing.
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
^ This is a lie, setting it to "no" does nothing
You also need to delete /etc/ssh/sshd_config.d/50-cloud-init.conf which contains a single line:
PasswordAuthentication yes
Other people complaining about the same thing:
[0] https://www.mikeberggren.com/deb-ssh-auth
[1] https://askubuntu.com/questions/1516262/why-is-50-cloud-init-conf-created
[2] https://askubuntu.com/a/435620
Disabling password auth in `/etc/ssh/sshd_config` does nothing.
You also need to delete /etc/ssh/sshd_config.d/50-cloud-init.conf which contains a single line: Other people complaining about the same thing:[0] https://www.mikeberggren.com/deb-ssh-auth
[1] https://askubuntu.com/questions/1516262/why-is-50-cloud-init-conf-created
[2] https://askubuntu.com/a/435620