There are two modes of Ganache you can install: GUI mode and CLI mode.
To install Ganache GUI, download the Ganache-*.AppImage file from: https://github.com/trufflesuite/ganache/releases
After downloading, double click on the file, the installer will run and install Ganache for you.
To install the CLI mode, run the following command in the terminal:
$ npm install -g ganache-cli