[Bug 1311870] Re: pygrub on 12.04 don't start 14.04

[Fantu]

These will solves:

grub2 (2.02~beta2-16) unstable; urgency=medium

  [ Ian Campbell ]
  * Provide prebuilt grub-xen binaries for host use in a new grub-xen-host
    package.
  * Build/Install binaries into /boot/xen when installing grub-xen.

 -- Ian Campbell <ijc at debian.org>  Thu, 06 Nov 2014 13:32:01 +0000

http://anonscm.debian.org/cgit/pkg-
xen/xen.git/commit/?h=feature/bug770460&id=316adb14314e05cbf57d92d871ec88b6d870f925

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https://bugs.launchpad.net/bugs/1311870

Title:
  pygrub on 12.04 don't start 14.04

Status in “grub2” package in Ubuntu:
  Invalid
Status in “xen” package in Ubuntu:
  Confirmed

Bug description:
  After I upgrade one of my xen pvm ubnutu 13.10 installations to 14.04, I was not able to boot them any more on my ubutntu 12.04 dom0. Starting them results in following mesage:
  sudo xm create /etc/xen/lisa.cfg 
  Boot loader didn’t return any data!

  Within /var/log/xen/xend.log I found the following messages:
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:103) XendDomainInfo.create(['vm', ['name', 'lisa'], ['memory', 2048], ['on_xend_start', 'i$
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:2498) XendDomainInfo.constructDomain
  [2014-04-22 16:12:57 3466] DEBUG (balloon:187) Balloon: 7859516 KiB free; need 16384; done.
  [2014-04-22 16:12:57 3466] DEBUG (XendDomain:476) Adding Domain: 17
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:2836) XendDomainInfo.initDomain: 17 256
  [2014-04-22 16:12:57 32178] DEBUG (XendBootloader:113) Launching bootloader as ['/usr/lib/xen-4.1/bin/pygrub', '--output=/var/run/xend/boot$
  [2014-04-22 16:12:57 3466] ERROR (XendBootloader:214) Boot loader didn't return any data!
  [2014-04-22 16:12:57 3466] ERROR (XendDomainInfo:488) VM start failed
  Traceback (most recent call last):
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 474, in start
      XendTask.log_progress(31, 60, self._initDomain)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendTask.py", line 209, in log_progress
      retval = func(*args, **kwds)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2838, in _initDomain
      self._configureBootloader()
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 3285, in _configureBootloader
      bootloader_args, kernel, ramdisk, args)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendBootloader.py", line 215, in bootloader
      raise VmError, msg
  VmError: Boot loader didn't return any data!
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:3071) XendDomainInfo.destroy: domid=17
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:2406) No device model
  [2014-04-22 16:12:57 3466] DEBUG (XendDomainInfo:2408) Releasing devices
  [2014-04-22 16:12:57 3466] ERROR (XendDomainInfo:108) Domain construction failed
  Traceback (most recent call last):
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 106, in create
      vm.start()
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 474, in start
      XendTask.log_progress(31, 60, self._initDomain)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendTask.py", line 209, in log_progress
      retval = func(*args, **kwds)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 2838, in _initDomain
      self._configureBootloader()
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendDomainInfo.py", line 3285, in _configureBootloader
      bootloader_args, kernel, ramdisk, args)
    File "/usr/lib/xen-4.1/bin/../lib/python/xen/xend/XendBootloader.py", line 215, in bootloader
      raise VmError, msg
  VmError: Boot loader didn't return any data!

  After some time of try and error I also found a workaround for this
  issue, by removing the grub2 packages and installing the god old grub
  package within a chroot, as described here: http://0x23.de/2012/05
  /xen-ubuntu-12-04-upgrade-boot-loader-didnt-return-any-data/

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