sudo add-apt-repository -y ppa:ethereum/ethereum
PPA name not found Utility to add PPA repositories in your debian machine /usr/sbin/add-apt-repository ppa:user/ppa-name
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It's due to your Kali installation not having the correct apt
-related packages installed.
You'll need to install them first. There are various1 articles2 on the internet on how to do this. Alternatively, add the PPA by hand.
Or... just download the pre-built binaries from the Downloads page.