[xubuntu-users] GRUB error 15

[TC]

Hi,

I just installed Xubuntu Oneiric on a laptop but I can't boot to it.  I 
get a GRUB error 15 at stage 1.5.  

I installed from a USB stick (no CD in laptop) and partitioned my drive 
like so: 

/dev/sda1  ext4  /boot
/dev/sda2  ext4  /
/dev/sda3  ext4  /home
/dev/sda4  swap

At first I thought that maybe it doesn't read from sda1 but from sda2 so 
I copied files in sda1 to /boot on sda2 but it didn't help.

Any ideas how to fix it?  Thank you.