Play Flash and Quicktime files in Ubuntu

I'm starting to wonder if anything about Linux is going to be easy. But I remain undaunted in my efforts to use Ubuntu 7.10, or Gutsy Gibbon, to accomplish the same computing tasks I use Windows for. Now that I've got Flash and Quicktime working in Ubuntu, I feel like I'm nearly there.

I say "nearly" because I'm still running into some glitches, this week relating to getting the full suite of updates available for Gutsy installed. The update failure is a minor inconvenience compared to the crashes I experienced last week whenever I tried to run a Flash or Quicktime video.