I am using Ubuntu 13.10. My Youtube isn't playing since three days. I upgraded the system. Re-installed Ubuntu restricted extras package. Still not working.
It's not working with any browser... I tried firefox, chrome.
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Same thing happened with me a while ago with my ubuntu 14.04 gnome, and got no particular answer from the community.
What I did,
After successful installation of adobe-flashplugin package, when I looked for flash plugin(which is libflashplayer.so) in mozilla plugin directory (/usr/lib/mozilla/plugins/) it wasn't there. So I copied the plugin from
which i don't know why was there instead of mozilla/plugins directory. So, I copied from this folder to /usr/lib/mozilla/plugin/ and it worked for me.