This will add a keybinding (Alt+Shift) to switch the keyboard layout between us are ro.
Run:
echo 'Section "InputClass"
Identifier "Keyboard Defaults"
MatchIsKeyboard "yes"
Option "XkbLayout" "us, ro(std)"
Option "XkbOptions" "grp:alt_shift_toggle, grp_led:scroll"
EndSection' >> /etc/X11/xorg.conf.d/10-keyboard.conf
Reboot or restart xserver.
Works on every distribution. First check if /etc/X11/xorg.conf.d/10-keyboard.conf does exits, if it exists write to another file: eg: /etc/X11/xorg.conf.d/20-keyboard.conf.
On Debian with lxde, the path for xorg.conf.d is /usr/share/X11/xorg.conf.d.
Press Alt+Shift to switch between us and ro.
If you want other key, for ex: win : Option "XkbOptions" "grp:win_shift_toggle, grp_led:scroll".