Hi I get the connection failed error. I did all the basic things 1) Disabled firewall 2) Checked my router settings to make sure and i was able to ping that ip address 3) I backed up source list and ran apt clean
venkat@ml-turing-develop:~$ sudo apt update
[sudo] password for venkat:
Err:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Connection failed [IP: 91.189.91.39 80]
Err:2 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Connection failed [IP: 91.189.91.38 80]
Err:3 http://archive.canonical.com/ubuntu focal InRelease
Connection failed [IP: 185.125.188.12 80]
Err:4 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Connection failed [IP: 91.189.91.39 80]
Err:5 http://archive.lambdalabs.com/ubuntu focal InRelease
Connection failed [IP: 52.218.246.130 80]
Err:6 http://us.archive.ubuntu.com/ubuntu focal-security InRelease
Connection failed [IP: 91.189.91.38 80]
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/focal/InRelease Connection failed [IP: 91.189.91.39 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease Connection failed [IP: 91.189.91.38 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease Connection failed [IP: 91.189.91.39 80]
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/focal/InRelease Connection failed [IP: 185.125.188.12 80]
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/focal-security/InRelease Connection failed [IP: 91.189.91.38 80]
W: Failed to fetch http://archive.lambdalabs.com/ubuntu/dists/focal/InRelease Connection failed [IP: 52.218.246.130 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.