I've tried following:
sudo apt-get update; sudo apt-get dist-upgrade
I've played a little with pepper-flash as well. I tried what results on Google told me. Still with no success. At the end I made it work on Chromium, but I don't really now which attempt did the trick, since I tried a lot. It is still not working in Opera.
Once it worked in both Opera and Chromium. But then, I guess after a release, it didn't worked.
Hope you can give me a correct way to update adobe flash player for Opera and Chromium - and maybe make it work in a way, so I just need to upgrade my system to automatically upgrade flash player by a new release.