A new flavor of Ubuntu was just released earlier this week. Version 16 if I recall correctly.

I'm currently running Ubuntu on an IBM ThinkPad T42. However, it's running Ubuntu 12.04 LTS. There were some issues regarding Ubuntu 14, in light of the processor & memory; for what I'm doing at work with it (primarily evaluating and testing potential user interfaces, and right now working on learning SQL to supplement dBase), Ubuntu 12 is fine.

So if the newer Ubuntu versions won't install, or give you fits, be aware you can still download the older versions from their web site.