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Ran into a curios problem while updating the GitHub Actions Workflow for a project:

Run sudo lxc exec test-container --env DEBIAN_FRONTEND=noninteractive -- apt-get -y install -y openssh-client openssh-server openssh-sftp-server
Reading package lists...
Building dependency tree...
Reading state information...
openssh-client is already the newest version (1:8.9p1-3).
The following additional packages will be installed:
  libpsl5 libwrap0 ncurses-term publicsuffix python3-distro ssh-import-id wget
Suggested packages:
  molly-guard monkeysphere ssh-askpass ufw
The following NEW packages will be installed:
  libpsl5 libwrap0 ncurses-term openssh-server openssh-sftp-server
  publicsuffix python3-distro ssh-import-id wget
0 upgraded, 9 newly installed, 0 to remove and 0 not upgraded.
Need to get 1371 kB of archives.
After this operation, 7679 kB of additional disk space will be used.
Ign:1 http://archive.ubuntu.com/ubuntu jammy/main amd64 openssh-sftp-server amd64 1:8.9p1-3

...

Ign:9 http://archive.ubuntu.com/ubuntu jammy/main amd64 ssh-import-id all 5.11-0ubuntu1
Err:1 http://archive.ubuntu.com/ubuntu jammy/main amd64 openssh-sftp-server amd64 1:8.9p1-3
  Cannot initiate the connection to archive.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2620:2d:4000:1::16). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1562::18). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (185.125.190.39), connection timed out Could not connect to archive.ubuntu.com:80 (185.125.190.36), connection timed out Could not connect to archive.ubuntu.com:80 (91.189.91.39), connection timed out

...

E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/s/ssh-import-id/ssh-import-id_5.11-0ubuntu1_all.deb  Cannot initiate the connection to archive.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2620:2d:4000:1::16). - connect (101: Network is unreachable) Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1562::18). - connect (101: Network is unreachable)
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Error: Process completed with exit code 100.

For the tests, I'm spinning up a LXC container on the Runner, and then try to install software in it. This specific Runner is using Ubuntu 22.04 (new), and the network connection to archive.ubuntu.com is failing. Another Runner in the same workflow, using Ubuntu 20.04, is working fine. 20.04 was the old test setup, 22.04 is the new one. No other changes. But why is it suddenly failing?