This is a bit strange as we do run Ussuri scenario jobs with L3-HA, see e.g. https://zuul.opendev.org/t/openstack/build/508a4cc49b0844978d107b74ed18982d/logs and it works fine. It also runs on Ubuntu Bionic.
Can You check what keepalived version do You have, maybe compare other Your packages with what was used in that job and also share with us full L3 agent's log with errors which You have?
This is a bit strange as we do run Ussuri scenario jobs with L3-HA, see e.g. https:/ /zuul.opendev. org/t/openstack /build/ 508a4cc49b08449 78d107b74ed1898 2d/logs and it works fine. It also runs on Ubuntu Bionic.
Can You check what keepalived version do You have, maybe compare other Your packages with what was used in that job and also share with us full L3 agent's log with errors which You have?