I tried to have exactly the same grub config as the article however it didn’t work.
 
 
From: listmail [mailto:listmail@xxxxxxxxxxxx]
Sent: Thursday, October 07, 2010 6:14 PM
To: Sufiah Marcellina (Excell Data Corporation)
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Unable to boot after installing xen 4.0.1 on Ubuntu 10.04
 
 
 
On 10/7/2010 9:04 PM, Sufiah Marcellina (Excell Data Corporation) wrote:
Hi,
 
I’m trying to install Xen 4.0.1 on Ubuntu 10.04. I’ve followed the installation instruction from:
(http://bderzhavets.wordpress.com/2010/04/24/set-up-ubuntu-10-04-server-pv-domu-at-xen-4-0-dom0-pvops-2-6-32-10-kernel-dom0-on-top-of-ubuntu-10-04-server/)
 
Everything seems to install properly. However, when I am unable to boot into the Xen kernel.
 
Here is my grub config:
 
menuentry "Xen 4 Ubuntu 10.04 kernel 2.6.32.24" {
     insmod ext2
     set root='(hd0,5)'
     multiboot /boot/xen-4.0.1.gz dom0_mem=1024M
     module /boot/vmlinuz-2.6.32.24
     root=/dev/sda5 ro 
     module /boot/initrd.img-2.6.32.24
}
 
 
 
 
  
  
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I assume that you mean your 40_custom.  You need the dummy=dummy parameter workaround. recheck his example grub config in the wordpress link and update your config accordingly