Error installing Cinelerra GG on Ubuntu 20.04

Question

I am following this instructions: https://www.cinelerra-gg.org/ubuntu-package/ which requires to do:

sudo apt-add-repository https://cinelerra-gg.org/download/pkgs/ub20

The error I am getting is:

Err:11 https://cinelerra-gg.org/download/pkgs/ub20 focal Release
  404  Not Found [IP: 2606:4700:3035::681b:8f12 443]
Reading package lists... Done
E: The repository 'https://cinelerra-gg.org/download/pkgs/ub20 focal Release'
  does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

What do I need to do to install it? (is perhaps the server down? 404 Not Found [IP: 2606:4700:3035::681b:8f12 443])

I tried their Forum to get support, but I am not getting the email verification for a new User - so I can't get help.

Answer 1

We got this notice here at Cinelerra-gg.org and will try to do it ourselves to see if there is a problem.

UPDATE: we had no problem installing it. We believe that you probably just did not edit the file /etc/apt/sources.list as shown further down in the instructions. You have to include in that file the line:

deb [trusted=yes] https://cinelerra-gg.org/download/pkgs/ub20 focal main

If that line in not in the file or correctly in the file, fix it. Then:

sudo apt update

sudo apt install cin