I just installed Kubuntu 12.04 (64 bit), and I'm having problems with Flash. I installed the kubuntu-restricted-extras package + Firefox. After opening Firefox and going to YouTube to test Flash, I noticed that Firefox was not recnogizing the Flash installation from kubuntu-restricted-extras. It prompted me to install it from within the browser, which I did. After that, YouTube videos started working; they are, however, choppy. In addition, websites are recnogizing the installation as an outdated version of Flash; which means I cannot watch embedded YouTube videos (among other things). I have verified that flashplugin-installer is installed. This happens in every browser I have tested it in. Does anybody know what's going on?