実行環境

OS: Windows11
WSL2
kali-linux
/etc/apt/sources.listはデフォルト

エラー内容

WSL2のディストリビューションをkali-linuxに設定
「wsl -d kali-linux」でkali-linuxを起動
初回起動のため、「sudo apt update」を実施
エラー発生

Error発生

└─$ sudo apt update
[sudo] password for kali:
Ign:1 http://http.kali.org/kali kali-rolling InRelease
Ign:1 http://http.kali.org/kali kali-rolling InRelease
Ign:1 http://http.kali.org/kali kali-rolling InRelease
Err:1 http://http.kali.org/kali kali-rolling InRelease
  Temporary failure resolving 'http.kali.org'
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease  Temporary failure resolving 'http.kali.org'
W: Some index files failed to download. They have been ignored, or old ones used instead.

対処法

「sudo vi /etc/resolv.conf」を開く
「nameserver 8.8.8.8」を追加
※「ipconfig /all」で自分のDNSを調べて使用してもいい

# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
nameserver 8.8.8.8
# 8.8.8.8: Google Public DNS

3．保存して閉じる
4．もう一度、「sudo apt update」を実施

通った！

Get:1 http://ftp.jaist.ac.jp/pub/Linux/kali kali-rolling InRelease [30.6 kB]
Get:2 http://ftp.jaist.ac.jp/pub/Linux/kali kali-rolling/main amd64 Packages [18.8 MB]
Get:3 http://ftp.jaist.ac.jp/pub/Linux/kali kali-rolling/contrib amd64 Packages [111 kB]
Get:4 http://ftp.jaist.ac.jp/pub/Linux/kali kali-rolling/non-free amd64 Packages [237 kB]
Fetched 19.2 MB in 8s (2,504 kB/s)
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
143 packages can be upgraded. Run 'apt list --upgradable' to see them.

参考文献

この記事は、以下の情報を参考にしました。

Failed to update Kali "failed to fetch http.kali.org/kali" #1258
　https://github.com/CypherpunkArmory/UserLAnd/issues/1258
WSLにてapt update時の『Temporary failure resolving ~』を解決する方法
　https://qiita.com/ryosukeYamazaki/items/c04ec3ff78aac6eb8d26