Comment 2 for bug 189188

Do other sites that use flash like Youtube work? If not, this is a duplicate of Bug 173890.

The solution to this problem would be to completely remove flashplugin-nonfree in Synaptic, the downloaded flashplugin package, and then reinstall flash.

In Terminal (Applications -> Terminal), run the following commands one at a time.

sudo apt-get remove --purge flashplugin-nonfree
sudo rm -f /var/cache/flashplugin-nonfree/install_flash_player_9_linux.tar.gz
sudo apt-get update
sudo apt-get install flashplugin-nonfree

Please specify if this solution works.