Try it doing it from the command line. i.e:
sudo add-apt-repository ppa:mscore-ubuntu/mscore-stable
And then to install MuseScore:
sudo apt-get update sudo apt-get install musescore
Try it doing it from the command line. i.e:
sudo add-apt-repository ppa:mscore- ubuntu/ mscore- stable
And then to install MuseScore:
sudo apt-get update
sudo apt-get install musescore