Hi All,
Debian Buster, AMD64, KDE Desktop.
I installed a ppa using the following code:
sudo add-apt-repository ppa:elmer-csc-ubuntu/elmer-csc-ppa
This installed 
    
elmer-csc-ubuntu_ubuntu_elmer-csc-ppa.gpg
in my /etc/apt/trusted.gpg.d directory. So far so good.
But when I run apt-get update I get:
         E: The repository
        'http://ppa.launchpad.net/elmer-csc-ubuntu/elmer-csc-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.
If I added the -s switch to add-apt-repository ie sudo add-apt-repository -s ppa:elmer-csc-ubuntu/elmer-csc-ppa ,
I get :
        gpg: keybox '/tmp/tmpxocgqxov/pubring.gpg' created
            gpg: /tmp/tmpxocgqxov/trustdb.gpg: trustdb created
            gpg: key 89358ABF9FB7E178: public key "Launchpad PPA for
        Elmer CSC ubuntu packaging" imported
            gpg: Total number processed: 1
            gpg:               imported: 1
            gpg: no valid OpenPGP data found.
Apt-get update still errors out. I don't seem to have the gpg key installed. How do I fix this problem.
    
Gary R.