Comment 1 for bug 1630909

The root cause seems to be that I miss something to properly add the console to the guest.
As listed above it has no /dev/ttyS0 or any such.

Usually adt would set console=ttyS0 for the kernel parmline which it doesn't on s390x yet.
But obviously if doing so it only ends in failing to spawn anything on there as the tty device doesn't exist.

[...]
[*** ] A start job is running for dev-ttyS0.device (6s / 1min 30s)
[ TIME ] Timed out waiting for device dev-ttyS0.device.

The main console still survives (falls back?) to sclp0
ubuntu@autopkgtest:~$ tty
/dev/ttysclp0

Whatever I miss I expect it to start with getting more than just:
ll /dev/tty*
crw-rw-rw- 1 root tty 5, 0 Oct 6 00:18 /dev/tty
crw------- 1 ubuntu tty 4, 65 Oct 6 05:16 /dev/ttysclp0