Run script at login screen

Question

I wrote a script which is supposed to run at the login screen (It reads the serial stream of an arduino and types my password into the password box .. ). How can I run this script after boot but before the login?

Answer 1

You can configure lightdm to call your script in /etc/init/lightdm.conf in such a way that it gets executed after starting lightdm. Just open the .conf file, and call your script under the section post-stop script.