Has anybody been able to overcome this issue while installing GDAL in Ubuntu 20.04 LTS or should I just downgrade my Ubuntu version?
sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable
Err:20 http://ppa.launchpad.net/mc3man/trusty-media/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80]
Err:21 http://ppa.launchpad.net/ubuntugis/ppa/ubuntu focal Release
404 Not Found [IP: 91.189.95.83 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu 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.
E: The repository 'http://ppa.launchpad.net/ubuntugis/ppa/ubuntu 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.
