I'm sorry if this is obvious to you, but your post makes it sound like you may have bought a laptop in the configuration listed and then tried to install Ubuntu. Quoting from the Ubuntu website you linked,
Standard images of Ubuntu may not work at all on the
system or may not work well, though Canonical and
computer manufacturers will try to certify the system
with future standard releases of Ubuntu.
Did you use a standard Ubuntu image, or get one pre-installed?
I used the standard Ubuntu image. I tried 12.04LTS, 13.10, and 14.04LTS alpha/beta/whatever.
I'm not sure it's possible to buy an x140e with Ubuntu preinstalled. When purchasing from Lenovo's website, the OS choices are all versions of Windows 7 and 8. It would be nice if this potentially modified version of Ubuntu was released somewhere.
