Have tried this but if i run onboard in the background the keyboard don't shows up. Only the terminal opens in this case.

I also tried the while command just for try&error but don't figured out yet how to exit the loop without repeating it.

Code:

#!/bin/bash
while onboard
do xfce4-terminal -e "sudo dpkg-reconfigure keyboard-configuration"
done
killall onboard
killall reconfig
exit 0

Edit:

if i run the onboard command in the terminal i get following message and the window gets blocked (no other commands possible):
might this cause this problem?

---------- Post updated at 07:52 PM ---------- Previous update was at 06:42 PM ----------

Ok solved the "onboard problem" with using exec. Now both commands runs all the time but now the keyboard isn't closing after the reconfiguration is done.

Code:

#!/bin/bash
xfce4-terminal -e "sudo dpkg-reconfigure keyboard-configuration" &
exec onboard
killall onboard
killall testrun
exit 0

How can i loop a if command like this at the end?

Code:

if ! pgrep -x "xfce4-terminal" > /dev/null
then
       killall onboard
fi

As the terminal get closed by itself after the reconfiguration i thought about to check if the terminal still is open and if not close keyboard.

Sorry for all those noob questions