Windows 10 WSL2 - Ubuntu - apt update with Temporary failure resolving

I'm running windows 10 with WSL2.I installed a distribution of Ubuntu 20.04.

When I do sudo apt update, it's working

Hit:1 http://archive.ubuntu.com/ubuntu focal InReleaseGet:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]Get:3 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]Get:4 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]Fetched 328 kB in 17s (19.3 kB/s)Reading package lists... DoneBuilding dependency treeReading state information... DoneAll packages are up to date.

Then I tried adding a repository for podman. In /etc/apt/sources.list

deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04/ /

But now when doing sudo apt update I got

Err:1 https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04  InRelease  Temporary failure resolving 'download.opensuse.org'Err:2 http://archive.ubuntu.com/ubuntu focal InRelease  Temporary failure resolving 'archive.ubuntu.com'Err:3 http://security.ubuntu.com/ubuntu focal-security InRelease  Temporary failure resolving 'security.ubuntu.com'Get:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]Get:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]Fetched 214 kB in 34s (6269 B/s)Reading package lists... DoneBuilding dependency treeReading state information... DoneAll 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://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Temporary failure resolving 'security.ubuntu.com'W: Failed to fetch https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.04/InRelease  Temporary failure resolving 'download.opensuse.org'W: Some index files failed to download. They have been ignored, or old ones used instead.

Yet a ping is working

PING download.opensuse.org (195.135.221.134) 56(84) bytes of data.64 bytes from download.opensuse.org (195.135.221.134): icmp_seq=1 ttl=58 time=36.9 ms64 bytes from download.opensuse.org (195.135.221.134): icmp_seq=2 ttl=58 time=35.9 ms

Removing the repository line and it is working.

What would be the problem ?

Edit

I asked other coworkers to try the same and it's working for them. So I suppose it is not a proxy or dns problem on the network. The last 'guilty' :-) seems to be my laptop. But why ?