Install Linux alongside 2 windows installations

[hybrid]

Do you think perhaps it could be all the 000000000000000's at menuentry 'Ubuntu, with Linux 2.6.32-21-generic' ?

 

This could well be the issue. I'm thinking it might also be the lines:

 

Code:

set root='(hd0,4)'

 

Since we don't have much to lose -- Kubuntu isn't booting anyway, what happens if you change the instance of set root='(hd0,4)' under the top Ubuntu menu entry to:

 

Code:

set root='(hd0,3)'

 

I have a feeling the bootloader is looking for the Kubuntu OS on the wrong partition.