I get the following error message using WSL2 Ubuntu:
$ ping google.com
ping: google.com: Temporary failure in name resolution
To fix this do the following:
$ sudo nano /etc/resolv.conf
Change or add:
nameserver 8.8.8.8
You probably have to do this each time you start a session. I think there is a fix, but my company has a security policy that I cannot change locally. Maybe, I can run a script during the session opening to update this file.