Ok, so the fact that we thought this worked is clearly the result from
bad testing on our part, probably because of our simplestreams parsing
code we fixed yesterday...

We obviously still need to move LXD onto this images as booting the non-
kvm images takes twice as long as it should (due to them panic + reboot
every time) AND also breaks cloud-init, at least in the way we'd like to
use it.


Now realistically this can't be fixed in time for 20.04, so what we've done is 
submitted a change to simplestreams to force all LXD users onto the non-kvm 
image:
  
https://code.launchpad.net/~stgraber/simplestreams/+git/simplestreams/+merge/382597

We'll also tell all users of `ubuntu:` and `ubuntu-daily:` that they need to do:
 - lxc config device add NAME config disk source=cloud-init:config

Which passes a stable config drive to cloud-init, avoiding the cloud-
init issue they'd be getting out of the box.


Moving forward, we'd like the -kvm kernel to be both EFI enabled AND signed. 
This will then allow those images to work properly inside LXD, at which point 
we can undo the simplestreams change and have those images used once again by 
our users.

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https://bugs.launchpad.net/bugs/1873809

Title:
  disk-kvm.img aren't UEFI bootable

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