Comment # 1 on bug 1090402 from Thorsten Kukuk

You mean that, after the login prompt was schown, still new messages appears on
the screen?

This is normal and normally happens only at the first boot.
Reason: there are long running processes started during boot phase, which are
not required to be able to login. Like installing and configuring the
containers for the admin dashboard.

Since this can take a very long time: if we would wait with the login prompt
until the processes did exit, we would get a huge amount of bug reports, that
the machines hangs during boot.
So we allow to login when this is possible.