No connectivity after upgrading from Ubuntu 21.04 to 21.10

Not sure if it’s known or not… After upgrading the host from Ubuntu 21.04 to 21.10, LXD containers can’t connect to the internet using the standard lxdbr0 device created long ago with “lxd init”.

Looks the upgrade installed firewalld, which by default breaks LXD networking.

These helped:

systemctl disable firewalld
systemctl stop firewalld

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