The same issue exists in bionic-updates. Since it's already in updates you have to downgrade some neutron units (neutron-api and neutron-gateway in my case) to python-oslo.messaging=5.35.0-0ubuntu1 and restart neutron services in order to have the mismatched versions to recreate.
The same issue exists in bionic-updates. Since it's already in updates you have to downgrade some neutron units (neutron-api and neutron-gateway in my case) to python- oslo.messaging= 5.35.0- 0ubuntu1 and restart neutron services in order to have the mismatched versions to recreate.