I'm trying to use LXD to start VMs (not just containers).  LXD does this 
by invoking QEMU/KVM.  QEMU/KVM with Libvirt works just fine, but LXD 
complains that "QEMU failed to run feature checks".

I've posted a lot more detail in the LXD support forum in this thread 
<https://discourse.ubuntu.com/t/qemu-failed-to-run-feature-checks-how-to-find-out-what-checks/38824> 
including the results of logging and debug logging.

I thought I'd as here in case any of you know something, or are just 
curious.

It's probably a configuration problem.  There might be a missing step in 
the Wiki, or something wrong with packaging.  I'll try to fix those 
things when I find out what's up.

Thanks!