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

[Trev Peterson]

I also confirm that I can't boot any 14.04 LTS domU on Ubuntu 12.04 or
Debian Wheezy dom0s with the pygrub available in those repositories.
Hopefully 12.04 and wheezy both get pygrub updates to support 14.04
domUs.

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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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