Oh ok that's kool. I didn't know you could do that. I was wrong, it was a security update:
base-files (4.0.4ubuntu2.1) intrepid-security; urgency=low
* SECURITY UPDATE: change permissions of kernels copied from the Live CD
by Ubiquity 1.9.4 thru 1.10.9. LP: #290798.
* Correct group ownership of files changed by Ubiquity 1.7.5 thru 1.10.9.