I have the same symptoms as Nick in comment #4.
I installed Ubuntu 9.10 using Wubi, and then upgraded to Lucid. When I
try to boot the Lucid kernel, I get the "Must load kernel first" and
then when I disable "screen" I also see the "invalid magic number"
error. I am running the amd64 architecture packages on a machine with a
SU7300 Intel processor.
This entry works:
menuentry "Ubuntu, Linux 2.6.31-18-generic" {
insmod ntfs
set root=(hd0,2)
search --no-floppy --fs-uuid --set bc1235091234ca62
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.31-18-generic root=/dev/sda2
loop=/ubuntu/disks/root.disk ro
initrd /boot/initrd.img-2.6.31-18-generic
}
/dev/sda2 on /host type fuseblk
(rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
/dev/loop0 on / type ext4 (rw,errors=remount-ro)
This one fails:
menuentry "Ubuntu, Linux 2.6.32-11-generic" {
insmod ntfs
set root=(hd0,2)
search --no-floppy --fs-uuid --set bc1235091234ca62
loopback loop0 /ubuntu/disks/root.disk
set root=(loop0)
linux /boot/vmlinuz-2.6.32-11-generic root=/dev/sda2
loop=/ubuntu/disks/root.disk ro
initrd /boot/initrd.img-2.6.32-11-generic
}
--
Ubuntu Server 9.10 (karmic): grub2: error: invalid magic number
https://bugs.launchpad.net/bugs/487689
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