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W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_20.04 InRelease: The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4 home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>
W: Failed to fetch http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_20.04/InRelease The following signatures were invalid: EXPKEYSIG 0FAD31CA8719FCE4 home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.

His website shows the following instructions at the moment :
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echo 'deb http://download.opensuse.org/repositories/home:/stevenpusser/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/home:stevenpusser.list
curl -fsSL https://download.opensuse.org/repositories/home:stevenpusser/xUbuntu_20.04/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/home_stevenpusser.gpg > /dev/null
sudo apt update
sudo apt install palemoon
