If you installed Wubi on a drive different from the first one, you will probably see an error like this:
Do the following:
1) Press esc at the countdown after you select "Ubuntu"
2) Press "e" to edit the first menu entry
3) Press "e" to edit the line starting with "root (hd0,0)/ubuntu/disks"
4) You have to change the 2 numbers in there. The first number is the disk number -1, the second is the partition number -1. Change them to point to the disk/partition where you installed Wubi. If you installed Wubi on the third partition of the first harddisk, for instance, you will have to enter "root (hd0,2)/ubuntu/disks"
5) Press enter to confirm and "b" to boot
You should now be able to boot into Ubuntu. To make the above changes permanent. Open a terminal and type
sudo gedit /boot/grub/menu.lst
Edit (0,0) as explained above in the groot line, so that it points to the correct device. For sda2 that would be:
## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,1)/ubuntu/disks
Save and run the following command:
sudo update-grub
A bug has been opened to address the issue: https://bugs.launchpad.net/wubi/+bug/188460
It will hopefully be fixed in coming releases
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