Screen Resolution: xrandr "cannot find mode"
Running the command
xrandr --addmode VGA1 1360x1020
would have done just as well.
xrandr (without arguments) will list the existing modes and the ones that can be added.
You seem to have typed a small "x" in the modeline (1360x1020), but a capital "X" in
xrandr --addmode– Riccardo Murri