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.