Any hope for my ancient mac?

So, being a penniless student, I have this ancient mac that I would like get to be a bit more functional (it can't cope with broadband) while spending as little money as possible. I recently discovered the wonderfulness of ubuntu and I was wondering if I could get it to work on the mac. This is the information I have about the mac which I bought second-hand: Powermac G4, OS 9.1 57GB Capacity, 512MB Built-in memory. I am not very computer-savvy, so I would really appreciate any advice/ similar experience on getting an old mac up-to-date. Does it meet the requirements for installing ubuntu and if not, what does it need? Thank you very much!