Linux Mint

For Mint package install, go to:
    Administration->Software Sources->Additional Repositories->Add a new repository
   
(on some versions of Mint, you may have to substitute System for Administration) and enter the following line:

For Mint 18

deb [trusted=yes] https://cinelerra-gg.org/download/pkgs/mint18 xenial main

IMPORTANT NOTE: if you get a Malformed input error, you will have to manually add that line instead to the file:

/etc/apt/sources.list.d/additional-repositories.list

For Mint 19

deb [trusted=yes] https://cinelerra-gg.org/download/pkgs/mint19 bionic main

IMPORTANT NOTE: if you get a Malformed input error, you will have to manually add that line instead to the file:

/etc/apt/sources.list.d/additional-repositories.list

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