Where is a new repository for groovy?

I think you have three options:

  • leave things as they are, so continue to run 20.10 (now EOL)

    Remove problematic PPA by

    sudo add-apt-repository -r ppa:deadsnakes/ppa
    

    then retry package list update with

    sudo apt-get update
    

    Then use local old python versions by https://github.com/pyenv/pyenv-installer .

  • backup current system and then upgrade 20.10 to supported 21.04 using standard desktop procedure

    sudo apt-get update
    sudo apt-get dist-upgrade
    sudo reboot
    sudo do-release-upgrade
    

    Notes:

    1. I have tested this method on my RPi 4B without any issues.
    2. deadsnakes PPA does not provide packages for 21.04.
  • backup current system and do a clean install of 20.04 LTS (focal) which is supported by deadsnakes PPA. Then enable USB boot on it.

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