If you encounter issues then please get in contact by raising an issue on GitHub: https://github.com/tttppp/mountain_tapir In particular it would be useful to have any error messages that are seen when launching from the command line.
For versions of Ubuntu between 14.04 LTS (Trusty Tahr) and 15.10 (Wily Werewolf), as well as Ubuntu flavours that don’t include snap by default, snap can be installed from the Ubuntu Software Centre by searching for snapd.
Alternatively, snapd can be installed from the command line:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install mountain-tapir, simply use the following command: