It's easy to find out which version of Ubuntu you're running.
Just open up a command terminal and type:
You should see output similar to the following:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.10
As you can see, the computer that I ran the lsb_release command on is running Ubuntu version 10.10.
There's also a command to find out which kernel you have.