apt update is failing in 2004 with WSL 2

[jenishngl]

Environment

Windows build number: Microsoft Windows [Version 10.0.19041.450]
Your Distribution version: [Ubuntu 20.04
Whether the issue is on WSL 2 and/or WSL 1:  Linux version 4.19.104-microsoft-standard (oe-user@oe-host) (gcc version 8.2.0 (GCC)) #1 SMP Wed Feb 19 06:37:35 UTC 2020 || WSL 2

Steps to reproduce

1. I upgraded my PC from Windows 10 Enterprise 1909 to Windows 10 Enterprise 2004 using the Windows 10 Upgrade Assistant.
2. Then followed the steps to upgrade WSL 1 to WSL 2.
3. Then ran "wsl --set-version Ubuntu-20.04 2" to convert to WSL 2
4. After the above, now if I run sudo apt update, I am getting the below errors.

Err:1 http://archive.ubuntu.com/ubuntu focal InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu focal-security InRelease
  Temporary failure resolving 'security.ubuntu.com'
Err:3 http://archive.ubuntu.com/ubuntu focal-updates InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Err:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease
  Temporary failure resolving 'archive.ubuntu.com'
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease  Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Expected behavior

"sudo apt update" should connect to the servers and fetch the updated list

Actual behavior

"sudo apt update" is failing

[therealkenc]

/dupe #5256 #3438 etc

[ghost]

Hi! We've identified this issue as a duplicate of another one that already exists in this repository. This specific instance is being closed in favor of tracking the concern over on the referenced thread.

Thanks for your report!

[masterEddie]

vim /etc/resolv.conf
添加
nameserver 8.8.8.8
nameserver 8.8.4.4

[decuser]

@masterEddie's tip to edit resolv.conf is a great workaround.