E: The repository 'http://ppa.launchpad.net/daniel.pavel/solaar/ubuntu focal Release' does not have a Release file.
a recovering method
sudo apt-add-repository -r ppa:daniel.pavel/solaar
sudo apt update -q
ref: https://askubuntu.com/questions/1054252/the-repository-http-ppa-launchpad-net-armagetronad-dev-ppa-ubuntu-bionic-rele?newreg=a7920fedb49145f2b9577c5f3febc21b
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