Run a script on first boot after install in 16.04

Tom H tomh0665 at
Fri Jul 22 13:23:27 UTC 2016

On Fri, Jul 22, 2016 at 3:59 AM, Josef Wolf <jw at> wrote:
> My postinstall-script that is started on first bootup starts a screen session.
> This way, it can prompt me to query for additional information, and I am able
> to to start new shell sessions for investigating any problems that can come
> up.
> unfortunatley, while waiting for my script to finish (that can last some
> hours!), systemd outputs a message telling me that it is waiting for it to
> finish. It repeats this message multiple times per second to show a red dot
> moving from left to right and back again. This output destroys all the output
> in my screen session and I can't seen any prompt (it is immedeately
> overwritten). I can't even see what I am typing when I start a new shell in
> screen by CTRL-A CTRL-C!
> This output is thrown at whatever termial I switch, so switching terminals
> won't help.
> Why won't this output stay on virtual console 1? How can I disable it?

Does this happen if you set kernel.printk to '3 4 1 3' from your
script or from "/etc/sysctl.d/"?

IIRC, the red dot is called "Eye of Cylon" (see Battlestar Galactica)
but I've only ever seen it at shutdown. Is your system shutting down
at that point?

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