No Doubt ubuntu is best linux now-a-days but some time problem came with flash extension so here we go how to play our videos on Ubuntu.Follow the instruction as given below:

"wget http://queleimporta.com/downloads/flash10_en.sh

Now you need to give execute permissions using the following command

sudo chmod +x flash10_en.sh

Run the script now

sudo sh ./flash10_en.sh"

Enjoy Youtube ;)