Xmodmap

   1 clear Lock
   2 clear Control
   3 clear Mod1
   4
   5 keycode 64 = Control_L
   6 keycode 108 = Control_L
   7 add Control = Control_L
   8
   9 keycode 37 = Alt_L
  10 keycode 66 = Alt_L
  11 keycode 105 = Alt_R
  12 add Mod1 = Alt_L Alt_R