Crie o arquivo .Xmodmap
nano /.Xmodmap
Adicione as novas definições
keycode 134 = ISO_Level3_Shift NoSymbol ISO_Level3_Shift NoSymbol ISO_Level3_Shift
clear mod4
keycode 108 = Super_R
add mod4 = Super_R
Reaload xmodmap
xmodmap /.Xmodmap
E verifique com xev
KeyPress event, serial 36, synthetic NO, window 0x2600001,
root 0x26b, subw 0x0, time 10943583, (116,83), root:(153,147),
state 0x10, keycode 108 (keysym 0xffec, Super_R), same_screen YES,
XLookupString gives 0 bytes:
XmbLookupString gives 0 bytes:
XFilterEvent returns: False
KeyRelease event, serial 36, synthetic NO, window 0x2600001,
root 0x26b, subw 0x0, time 11023111, (106,110), root:(143,174),
state 0x90, keycode 134 (keysym 0xfe03, ISO_Level3_Shift), same_screen YES,
XKeysymToKeycode returns keycode: 92
XLookupString gives 0 bytes:
XFilterEvent returns: False