Here's what I did in Ubuntu 12.04 to watch them:
1. Use Firefox.
2. Make sure Firefox is closed.
3. Run: sudo apt-get install libhal1 hal
4. Run: rm -rf ~/.adobe/Flash_Player/NativeCache ~/.adobe/Flash_Player/AssetCache ~/.adobe/Flash_Player/APSPrivateData2
5. Launch Firefox and enjoy.
After I did this in Firefox, I was able to watch them in Chromium too but ran into problems trying to get it working in the first place in Chromium. I've read that Google Chrome simply won't play them on Linux because of some recent changes Google made. So, yea... not as easy as it should be but it should be watchable unless I've missed a different reason why they're not watchable for so many users.