Public bug reported:

I just got 1:2.6.1+dfsg-0ubuntu3. Now, when starting some of my VMs-

laney@nightingale> virsh start xenial-vm
error: Failed to start domain xenial-vm
error: internal error: process exited while connecting to monitor: 
2016-09-21T12:20:27.252537Z qemu-system-x86_64: -enable-kvm: unsupported 
machine type
Use -machine help to list supported machines

It's because the configuration has

    <type arch='x86_64' machine='pc-i440fx-wily'>hvm</type>

(I created the VM on a system which didn't know about xenial at the
time). Fixing it to xenial there works.

However, this took some effort to work out - as you can see the error
message is particularly cryptic. In fact I was using virt-manager to
launch it, but that just prints the same message.

Is it possible to deal with this somehow? Like by restoring the old
releases, migrating VMs to a newer one, or at least printing a better

** Affects: qemu (Ubuntu)
     Importance: Undecided
     Assignee: ChristianEhrhardt (paelzer)
         Status: New

** Changed in: qemu (Ubuntu)
     Assignee: (unassigned) => ChristianEhrhardt (paelzer)

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  Removal of former release machine types breaks VMs using them

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