I updated kubuntu 12.04 this a.m. on my other laptop. The kernel headers and 2 other kernel packages weren't marked for updating. Didn't mark them.

This has happened before and I just marked them anyway. Until once on this netbook, after update I had no brightness control other than the terminal. Eventually figured out how to get control back from the keyboard but it was a huge pain finding out how to do this. Usually this forum helps but nothing that time.

I've done a fair bit of searching on this and I haven't been able to find any germane information on this subject.

So, can anyone point me in a direction that explains why this happens and what I should do about it?