I modified grub to have an additional boot option called 'CUSTOM-TEST'
and booted into that.
$ ent="Ubuntu, with Linux $(uname -r)"
$ cust="CUSTOM-TEST"
$ sed -n -e "s/${ent}/${cust}/" \
-e "/^menuentry '${cust}'/,/}/p" \
< /boot/grub/grub.cfg | sudo tee /boot/grub/custom.cfg
$ sudo sed -i 's,xen_emul_unplug=unnecessary,,' /boot/grub/custom.cfg
$ sudo grub-set-default "${ent}"
$ sudo grub-reboot "${cust}"
$ sudo update-grub
$ grep -v "^#" /boot/grub/grubenv
saved_entry=CUSTOM-TEST
prev_saved_entry=Ubuntu, with Linux 2.6.37-12-virtual
$ cat /boot/grub/custom.cfg
menuentry 'CUSTOM-TEST' --class ubuntu --class gnu-linux --class gnu --class os
{
recordfail
set gfxpayload=$linux_gfx_mode
insmod part_msdos
insmod ext2
set root='(hd2,msdos1)'
search --no-floppy --fs-uuid --set=root
f7ac8333-d0de-4c19-b130-794dbd905a44
linux /boot/vmlinuz-2.6.37-12-virtual
root=UUID=f7ac8333-d0de-4c19-b130-794dbd905a44 ro vt.handoff=7 console=ttyS0
initrd /boot/initrd.img-2.6.37-12-virtual
}
$ sudo reboot
The above does a "boot once" into that custom test kernel, so that
subsequent reboots will go back into working kernel.
** Attachment added: "console after reboot without argument"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/704022/+attachment/1796955/+files/rebooted-without-arg.txt
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https://bugs.launchpad.net/bugs/704022
Title:
xen_emul_unplug=unnecessary on kernel cmdline is required in ec2 hvm
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