Comment 4 for bug 156428

I have no idea but I *know* that one of my machines dies right after finishing booting here with Gutsy. The stopgap measure was to just boot with the older, feisty kernel (letting grub know that the default boot entry was the feisty one because that machine is headless and I don't have time to lug around a monitor just to diagnose the clunker). There's no easy way to point-and-click your route to the installatin of the feisty kernel, but if you manage to do it, you will have no problems because the feisty kernel works just fine with Gutsy.

I'm really sorry I can't fix the issue, but you should really report this backtrace in Launchpad Bugs.