Yep, that tells me everything. Your system specs are pretty old, you need at least DX9 capable 3d graphics acceleration. EoSD might run faster because it's the oldest of the Windows games and doesn't do as much as they do.
If you're running Ubuntu your X11 setup should have direct 3d access out of the box, so no issues there. Otherwise just make sure you're running the latest version of Wine. And get a faster CPU and videocard, although your system sounds like a laptop...