Just certain programs.. Nothing big... The main complaint I have with Ubuntu 12.04 is it's finicky at times with wireless connectivity..
When I travel if I bring that Win 7 laptop I will use Win 7 exclusively.. 12.04 at times is just a PITA wirelessly. Even here at home, it'll work, it'll work, then the 9th time or whatever I open the lid and bring it out of stand-by it won't connect to my home network, and I have to re-boot..
I do not know if 13 and 14 are as finicky. This desktop with 14.04 isn't wireless.
I think you'll be fine with Lubuntu..