[Bug 1573095] [NEW] 16.04 cloud image hangs at first boot

[zero]

Public bug reported:

I tried to launch a ubuntu 16.04 cloud image within KVM.
The image is not booting up and hangs at 

"Btrfs loaded"

Hypervisor env is Proxmox 4.1

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Package changed: livecd-rootfs (Ubuntu) => ubuntu

** Summary changed:

- Cloud image hangs at first boot
+ 16.04 cloud image hangs at first boot

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https://bugs.launchpad.net/bugs/1573095

Title:
  16.04 cloud image hangs at first boot

Status in Ubuntu:
  New

Bug description:
  I tried to launch a ubuntu 16.04 cloud image within KVM.
  The image is not booting up and hangs at 

  "Btrfs loaded"

  Hypervisor env is Proxmox 4.1

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