Kernel Problem?

[Leonard Chatagnier]

"Your system encountered a serious kernel problem." Your system may become unstable and may need to be restarted or to that effect. A button appears in the message to allow reporting the problem which I have done once.
The above appears every time I start the computer since the last couple of upgrades. Running Karmic Beta with Kubuntu Desktop on 64 bit. System has performed better before the last couple of upgrades.
Anyone experiencing the same issue or know a fix?  I am fully up-to-date; however, the update notifier in the system tray has stopped giving notice of available updates in about the same time frame but aptitude update shows they are available.
Appreciate any comments,(BTW, the system appears ok, doesn't crash and runs fine after clearing out the message(s))
Leonard Chatagnier
lenc5570 at sbcglobal.net