keepalived: 1:1.3.9-1ubuntu0.18.04.2
from: http://archive.ubuntu.com/ubuntu bionic-updates/main

neutron-l3-agent.log filled with the following log lines for every single 
router in our cluster:
2021-06-10 19:59:53.602 328191 ERROR neutron.agent.l3.ha_router [-] Gateway 
interface for router 9f276b0e-8581-4312-8780-ff4503c3df07 was not set up; 
router will not work properly

We have 3 controllers and use l3 HA and usually have 1 l3 agent per
controller, 2 standby, 1 active.

We rolled back to 16.0.0 (only because we could not find 16.3.0
anywhere) and the issue stopped. OP was able to roll back to 16.3.0 and
said the issue went away so I think we should focus on 16.3.1+

Before upgrading to Ussuri we did briefly upgrade to the latest Train
packages, give me some time to see if I can see if those error messages
started when we were briefly on latest Train packages. I need to do some
cross-referencing for that.

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https://bugs.launchpad.net/bugs/1927868

Title:
  vRouter not working after update to 16.3.1

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