For Mint package install, go to:
    System->Software Sources->Additional Repositories->Add a new repository
and enter the following line:

For Mint 18

    deb [trusted=yes] https://cinelerra-gg.org/download/pkgs/mint xenial main

For Mint 19

    deb [trusted=yes] https://cinelerra-gg.org/download/pkgs/mint bionic main

Then run these commands from a terminal to install:

    apt update
    apt install cin

To update a previous install, run:

    apt update
    apt upgrade cin

To remove Cinelerra-GG, run:

    apt remove cin