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.
LP: #288479.