I can confirm this bug in 12.04.
I'm dual booting Ubuntu and Fedora both on logical volumes with a shared
home directory. The auto-detected Fedora system always results in the
error that it cannot find (or load?) the kernel. However, I am able to
boot with the following entries in /etc/grub.d/40_custom
# cat /etc/grub.d/40_custom
! /bin/sh
set -e
echo "
menuentry 'Fedora-Ubuntu, with Linux 3.6.10-2' --class fedora --class gnu-linux
--class gnu --class os {
recordfail
insmod gzio
insmod lvm
insmod part_msdos
insmod ext2
set root='(vg_losgar-lv_fedora)'
search --no-floppy --fs-uuid --set=root
e1726ee3-9b60-4d74-8995-fe714e94aec0
linux /vmlinuz-3.6.10-2.fc17.x86_64
root=/dev/mapper/vg_losgar-lv_fedora ro quiet splash vt.handoff=7
initrd /initramfs-3.6.10-2.fc17.x86_64.img
}
"
The issue with this workaround is it has to be manually updated and have
update-grub re-run in Ubuntu everytime I update the fedora kernel.
The file /boot/grub/default no longer seems to be present
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https://bugs.launchpad.net/bugs/430659
Title:
grub2 cannot find kernel in dual kubuntu/xubuntu 9.10 boot scenario
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