How to log into your UBOS Device

/docs/users/faq-howto-troubleshooting/howto-login/

I cannot login as root into a UBOS container from the console

If the error message is “login incorrect”, that may be because somebody in an upstream package (not sure which upstream package, but it wasn’t us) changed the terminal for the root console. To make this work again, from your host, edit the /etc/securetty file by adding a new line with the content pts/0.

For example, if your container’s root directory is at ~/ubos, as root, you would be editing file ~/ubos/etc/securetty.