Xen users - Jun 2013 - VmError: Boot loader didn't return any data!

Last week this domU was starting fine, I may have done an upgrade with apt
(I don''t remember), but now it won''t start.

dom0: Debian Squeeze x64
domU: Ubuntu 12.04 Server x64

When I try to start it, I get *VmError: Boot loader didn''t return any
data!*Here''s the content of xend.log:

*[2013-06-03 13:10:33 1649] ERROR (XendDomainInfo:106) Domain construction
failed
Traceback (most recent call last):
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
104,
in create
    vm.start()
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
469,
in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendTask.py", line 209,
in
log_progress
    retval = func(*args, **kwds)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
2820,
in _initDomain
    self._configureBootloader()
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
3266,
in _configureBootloader
    bootloader_args, kernel, ramdisk, args)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendBootloader.py", line
215,
in bootloader
    raise VmError, msg
VmError: Boot loader didn''t return any data!
*
Through some googling, This is apparently a relatively common problem.  I
tried mounting the domU LV, removed grub2 and installed grub, but to no
avail.  Any suggestions?

-- 
Thanks,
Matt Baer
Network Manager
Leaf River Telephone Company
102 W Second Street
Leaf River, IL
 815.738.2211 - Main Office
866.738.2211 - Toll Free
mbaer@lrnet1.com


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On Mon, 2013-06-03 at 13:16 -0500, Matt Baer wrote:
> Through some googling, This is apparently a relatively common problem.
> I tried mounting the domU LV, removed grub2 and installed grub, but to
> no avail.  Any suggestions?
If you can''t track down the actual pygrub error message
under /var/log/xen (I''ve no idea where xend leaves them I''m
afraid) then
you might find that running pygrub by hand on the domain''s root device
will provide some enlightenment. Hopefully the command line to use is in
the xend.log too...

Ian.