I also happened to do an upgrade from Intrepid to Jaunty on my 3 year old machine (2 GHz Core2). It turns out that I experienced *exactly* the same problems as described in the article. My machine ended up being really slow as soon as there was any IO operations in the background. I also encountered the keyboard lockups with the mouse still functioning. The problems also started with the "upgrade" to Jaunty. My conclusion is that Jaunty is a terrible distro (I wasn't too happy about Intrepid before it, but Jaunty is definitely worse). I'll try out Karmic when it's released, but if this one is also bad, I'm considering switching back to Fedora (last Fedora I used was FC2, which was totally broken on my machine).