From Ubuntu 12.04 I upgraded to 64 bit version. Mostly it was smooth but then I stuck by flash. First Chrome 64bit don't have built in flash plugin, that means Google's flash for Linux is not anything if you are using 64 bit. After I installed adobe flash from repository, I am suffering random memory leaks and HANG on chrome for pages with Flash. It was smooth before with Chrome 32 bit on ubuntu 11.10 32 bit. If Gnash or Lightspark support Youtube and Angry Birds for Facebook smoothly, then I would remove the crapy Adobe Flash.