Linuxwacom works perfect.
First, let me say that I am a computer scientist, software developer, and enterprise architect who has been using Linux (and AIX, and Solaris, and HP-UX, and IRIX) on servers for nearly 20 years. My advice on this: don't waste your time! If you want to use a digitizer tablet (or other obscure hardware), just buy a PC or Mac. After many wasted hours of trial and error, sifting through conflicting instructions, I finally got everything built and installed only to find out that it hosed my entire Ubuntu install, requiring a complete reinstall of the OS. No support, no advice, no luck...I'd say you get what you pay for but I already paid for a tablet and now it seems I'll need to pay for a Windows OS to use it! *sigh* I'll give it two stars since it seems to have worked for a couple of people.
There are no 4 star reviews.