as you can see from the title i once changed my keybord layout into turkish using this command on the terminal
sudo dpkg-reconfigure keyboard-configuration
The terminal said, i should restart the machine, so that the changes would get applied.This i did only to realize, that i cannot login anymore, because some german letters are not included in the turkish keyboard layout.
The way i solved this, was as following. I created an Ubuntu-Live-Usb with the Laptop of my girlfriend, thats really easy to do on windows.
Than i used chroot to mount the ubuntu on my laptop, to the Live-USB. After that i cd'd into the home directory of the mounted ubuntu and there deployed the same terminal command
sudo dpkg-reconfigure keyboard-configuration
to get it back to the german Layout.