In order zu use a Xbox 360 Wireless Controller for OSMC, I followed the instructions from "Yggdrasil" until the third point. After a first reboot, everything is fine and the controller can control the system.
When I reboot the Raspyberry Pi 3 a second time, the controller no longer works.
I found out, that after entering the following commands, the controller will work again:
sudo chmod +x /home/osmc/xbmc.ini
sudo chmod +x /home/osmc/buttonswap.ini
sudo chmod +x /home/osmc/start.sh
How is it possible to use the Xbox 360 controller without this input every time?