Public bug reported:

Binary package hint: grub

I installed Ubuntu Server 9.10 (karmic) using text-based installer into
a KVM VM.  During installation I provided console args after "quiet
splash" so that a serial console would work.  After installation the
hypervisor reboots the VM and reconnects me to domain console.  There is
no console output.

I boot the VM using the 9.10 iso file and enter rescue mode.  The kernel
args are fine in grub.cfg but upstart is not configured for a serial
console so I configure one.  Create a /etc/default/grub file with serial
console definitions. Do a 'update-grub' and a 'grub-install /dev/sda'
and exit.  set hd as boot dev and reboot.  The serial console now works
but I'm getting this message on console:

error: invalid magic number

  Failed to boot default entries.

Press any key to continue...


Something is obviously wrong with grub2.  Is there any workaround to get this 
system booting?

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: New

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Ubuntu Server 9.10 (karmic): grub2: error: invalid magic number
https://bugs.launchpad.net/bugs/487689
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