tl;dr, The last line of my post is the real solution.

I fixed this problem. It took forever.

I tried following this:

What they tell you to do is essentially the following:

  • create a file /etc/adobe/mms.cfg (or just edit it if its already there)
  • Add the following two lines

This fixes the problem, but when I watch videos on any other website the flash player constantly crashes.

This isn't really a problem to do with adobe, because I have the same flash player installed on my laptop and it works fine. The problem is the nvidia package that uses hardware acceleration for playing flash videos.

The packages that governs the hardware acceleration for playing flash videos is called nvidia-current. Open Synaptic and remove it. Alternatively:

Open terminal and type the following:

sudo apt-get remove nvidia-current