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WSL2 cannot accès the internet on Windows 11

ayi

J'ai un fresh installation of Windows 11 avec ubuntu 20.04 installé inside wsl2.

When I try to perform an mise à jour sudo apt update or even ping google.com I get

Temporary failure resolving 'archive.ubuntu.com'

and

Temporary failure in name resolution

erreurs respectively.

I've tried:

Allowed wsl through the windows firefall using 'allow an app through the firewall' and selecting C:\Windows\System32\wsl.exe

Added inbound rule in firewall for port 3390

Set réseau profile to 'private' (although I would prefer to keep this public if there's a way to keep wsl fonctionnel)

running New-NetFirewallRule -DisplayName "WSL" -Direction Inbound -InterfaceAlias "vEthernet (WSL)" -Action Allow from a google search

EDIT: At this point J'ai essayé every google result and encore no solution. r/windows11 ne va pas let me post unless c'est a Monday (stupid). Également tried reinstalling ubuntu on wsl to no avail.

ayi

Il y a more than one cause for this problème.

The article
WSL2 Network Issues and Win 10 Fast Start-Up
advises to désactiver Fast Startup in Windows:

Another
explanation
is that switching networks (as entre work and
home) confuses WSL.
The solution is to run a .bat fichier that contains the following:

wsl --shutdown
netsh winsock reset
netsh int ip reset all
netsh winhttp reset proxy
ipconfig /flushdns
netsh winsock reset
shutdown /r

Encore another
explanation
is that Windows automatiquement generates a resolv.conf fichier avec
a wrong nameserver.

To prevent this from happening, exécutez le following commands:

sudo rm /etc/resolv.conf
sudo bash -c 'echo "nameserver 8.8.8.8" > /etc/resolv.conf'
sudo bash -c 'echo "[network]" > /etc/wsl.conf'
sudo bash -c 'echo "generateResolvConf = false" >> /etc/wsl.conf'
sudo chattr +i /etc/resolv.conf