Ed, I've got the same issue except I can't even log on here from home to post.
If you want to use a Linux program, then the only workaround that I've found is to install Google Chrome as opposed to Chromium. Chrome's supposed to have the latest flash version bundled with it. (here's a walkthrough for you: http://www.cyberciti.biz/faq/how-to-install-google-chrome-in-ubuntu-linux-12-xx-13-xx/ )
You could also use a Windoze version and run it via WINE. I've never used WINE, so can't vouch for it at all.
The drawback is that you're opening up your computer to Google. You'll be using their repositories as opposed to the vetted and peer-reviewed ones you'd use with Chromium. I guess it depends on how much you trust them not to screw your comp up?
My plan is to create a "play-drive" specifically for WGT (probably using a 16Gb Flash-stick as a pseudo-harddisk), and see how that works. Keep it totally clean except for the OS, Google Chrome, and a couple of other files...and cross my fingers.
"If it ain't broke, just wait for the next update and it probably will be...." ;-)
EDIT: Another option could be to install pepper flash. I just ran across it in reference to OpenSuse in another thread, and I know that you can get a Linux version, so I'll be trying that before installing Chrome. Lord knows what the meter will be like after all this though. Then again, I'll probably be happy just to be able to play... :-)