Comment 4 for bug 1766538

We don't quite have enough information here. It looks like there are multiple boots listed in this log (and ifconfig shouldn't be in stock bionic images too). Our expectation is that netplan renderer should always be used on Bionic with stock ubuntu images, not eni (etc/network/interfaces), so I'm not certain why the 'desktop' images that are being used are actually going down the route of writing ENI files.

You could try a "cloud-init collect-logs" on a fresh install and attach the cloud-init.tar.gz to this bug, but I fear this particular bug may not have enough information to be able to reproduce/understand what's going on.