Xenial generic and lowlatency kernels missing network on Oracle E3.Flex instances

[Francis Ginther]

Testing the xenial generic or lowlatency kernels will fail on Oracle VM.Standard.E3.Flex instance shapes due to networking. This appears to be the result of missing the necessary network driver in the xenial generic and lowlatency kernels.

When booting the xenial linux-oracle kernel:
[ 2.256062] mlx5_core 0000:00:03.0: Rate limit: 127 rates are supported, range: 0Mbps to 97656Mbps
[ 2.289391] mlx5_core 0000:00:03.0: MLX5E: StrdRq(1) RqSz(8) StrdSz(64) RxCqeCmprss(0)
[ 2.405213] mlx5_core 0000:00:03.0 ens3: renamed from eth0

And when booting the bionic linux generic kernel:
[ 2.035820] virtio_net virtio0 ens3: renamed from eth0

[Francis Ginther (fginther)]

Here's the serial console for the attempt to test on the xenial generic kernel. The system first boots on the xenial oracle kernel, then reboots to the xenial generic kernel.