Installing MuseScore on chromebook

I found a useful/no-useful link of https://musescore.org/en/howtochromeos it has some pretty useful tips although when I got to the terminal step I entered exactly as the picture showed but terminal still failed to complete the task - I attempted this step multiple times.

Is there still a way that I can get MuseScore to run on Chromebook; or is there a way to continue using this step by step guide?