I realize you would have no way to know the difference since you are new to this, but Ubuntu is a product of Canonical, Freescale just shipped a build for this board. As you can see, the problem has happened on regular PC's as well.
As for officially documented and fixed, it's possible it has been fixed in updates to Lucid, or perhaps this error was caused by some sort of file corruption. I can't say what the cause was. It's never happened to me.
This forum is good for hardware problems in relation to the QSB, device drivers that use the boards hardware (as opposed to say USB devices that Freescale has nothing to do with) and programming questions related to the Freescale hardware.
I didn't say you could not post any question you want, I said for a question like that you would be more likely to find the answer in a Ubuntu forum. This forum is for any question you may have, I just suggested that for some questions you may be better off googling the problem, as it could be a general Linux or Ubuntu problem. Sorry if you took it otherwise.
--Jim