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Simply download the .AppImage file, give it execute permission, and then run it!
More instructions at https://musescore.org/handbook/install-linux

The nightly builds allow you to test the very latest developments and bug fixes. The goal is to catch new crashes and regressions before they reach the prereleases or stable versions. For a more detailed description see http://www.musescore.org/en/handbook/comparison-stable-prerelease-and-nightly-builds
A nightly build can run side-by-side with other versions of MuseScore on the same computer. If you change the preferences in the nightly build it does not affect your preferences in the prerelease or stable versions of MuseScore. The nightly builds use a cymbal logo to visually differentiate them from normal versions of MuseScore. The cymbal is a play on the fact that nightly builds are likely to crash. If this sounds scary to you, use the latest stable release instead. For the latest stable version of MuseScore visit https://musescore.o…
Unlink this package from one of my repositories
MuseScoreNightly Portable AppImages for armhf (new 32-bit ARM) Linux systems. Automated builds of the 2.1 development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux
MuseScoreNightly Portable AppImages for i686 (32-bit Intel/AMD) Linux systems. Automated builds of the 2.1 development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux
MuseScoreNightly Portable AppImages for x86_64 (64-bit Intel/AMD) Linux systems. Automated builds of the 2.1 development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux
MuseScoreNightly Portable AppImages for armhf (new 32-bit ARM) Linux systems. Automated builds of the master development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux
MuseScoreNightly Portable AppImages for i686 (32 bit Intel/AMD) Linux systems. Automated builds of the master development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux
MuseScoreNightly Portable AppImages for x86_64 (64 bit Intel/AMD) Linux systems. Automated builds of the master development branch. FOR TESTING PURPOSES ONLY! Simply download the .AppImage file, give it execute permission, and then run it! More instructions at https://musescore.org/handbook/install-linux