Hello Devs

I am trying to do this statement on ubuntu while creating a coin and get an issue with this command:
sudo add-apt-repository ppa:bitcoin/bitcoin

When I run this, I get an issue where it says not maintained and get from bitcoin.org

When I run though download from there, I can't complete next set of instructions from this pastebin:
https://pastebin.com/Mu5z4kVc

I read that further statements in that pastebin will error if this is not done right.

Let me know the statements to add in Linux please.