hi o/ it looks like neutron recently moved linuxbridge to be experimental Jul 06 16:21:46.640517 ubuntu-focal-rax-ord-0030301377 neutron-server[90491]: ERROR neutron.common.experimental [-] Feature 'linuxbridge' is experimental and has to be explicitly enabled in 'cfg.CONF.experimental' we do not actully deploy it in nova-next or nova-ovs-hybrid-plug but it is enabeld in our job config as one of the configured mech drivers even if we dont install the agent. i have not looked up what change in neutron change this yet but im going to propose a patch to nova to disable it and i likely need to fix os-vif too so if you see a post fialure in either the nova-next of novs hybrid plug jobs (and or look into it and see " die 2385 'Neutron did not start'" in the Run devstack task summery that is why this is failing. ill update this thread once we have fixed the issue.