Why can't I initiate a connection?

Question

ubuntu

W: Failed to fetch security.ubuntu.com/ubuntu/dists/bionic-security/I... Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::15). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::24). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::23). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::18). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.39), connection timed out Could not connect to security.ubuntu.com:80 (91.189.88.142), connection timed out Could not connect to security.ubuntu.com:80 (91.189.91.38), connection timed out Could not connect to security.ubuntu.com:80 (91.189.88.152), connection timed out
W: Some index files failed to download. They have been ignored, or old ones used instead. initiate connection

Answer 1

Possible solutions: change nameserver in /etc/resolv.conf; disable antivirus.
Links to forums where the issue was discussed:
https://stackoverflow.com/questions/60269422/windo...
https://github.com/microsoft/WSL/issues/3669
https://social.technet.microsoft.com/ Forums/en-RU/...