I've recently installed Ubuntu Server 20.04 LTS on my old laptop to use it as a home server, and I think I accidently skipped past the network/Wi-Fi setup. Now every time I try running any kind of commands at the end of each one it shows this:
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy-backports/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/jammy-security/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
I can't even reinstall Ubuntu Server 20.04 LTS, please someone help!
