I accidentally selected the qwertz keyboard setup rather than the standard qwerty and can get a new selection menu to display to choose the correct set up

Click the at the top-left of the screen and click System Settings. Click Keyboard at left (You may need to scroll down to get it). Click the "Edit..." button at the right in the Text Input section. Click the + at the bottom-left of the window that opens. Click the desired keyboard in the list above the picture of a keyboard then click the ADD button. You should now have both QWERTZ and the newly selected keybord in the list at the left. Click the QWERTZ then click the - at the bottom of the list. Click the Done button.