For a (permanent) usa/greek keyboard configuration, using alt+shift for language switching:
- sudo vi /usr/lib/X11/xorg.conf.d/05-evdev.conf
- and modify
Section "InputClass"Identifier "evdev keyboard catchall"MatchIsKeyboard "on"MatchDevicePath "/dev/input/event*"Driver "evdev"EndSection
to
Section "InputClass"Identifier "evdev keyboard catchall"MatchIsKeyboard "on"MatchDevicePath "/dev/input/event*"Driver "evdev"Option "XkbLayout" "us,gr"Option "XKbOptions" "grp:alt_shift_toggle"EndSection
Change gr above to your language symbols, to get the proper keyboard layout.