That you're running Ubuntu is 99% of the entropy. Nobody uses Ubuntu (for certain values of nobody). The fonts you have installed. The versions of the plugins you have installed. &c.
I've long wanted to build a WebKit based browser that simply lies in response to all of those evil questions. Add it to my backlog of Important Projects, I guess.
> nothing in the info it gave back looked especially unusual.
It doesn't have to be unusual, it just has to vary slightly from machine to machine. It's the specific combination of those slight variations that's unusual.
I guess it would be somewhat rare (I am running Ubuntu) but not that rare.
I'd be interested to know how this can be, since nothing in the info it gave back looked especially unusual.