I feel lost with the installation, there are other commands given on GitHub and on electrum.org and other sites. As a non-experienced Linux user, I would like to know which is the correct way. Somehow this installation does not work for me. For example, I copied nord vpn and many others to a terminal and there was no problem. (the error note look like "error: externally-managed-environment.....")

I feel lost with the installation, there are other commands given on GitHub and on electrum.org and other sites. As a non-experienced Linux user, I would like to know which is the correct way. Somehow this installation does not work for me. For example, I copied nord vpn and many others to a terminal and there was no problem.