[Ubuntu]flashplugin doesn't work on firefox - Failed to load libpepflashplayer.so

You can get the newest version of flash player to firefox. Just do the following:

sudo add-apt-repository ppa:skunk/pepper-flash
sudo apt-get update
sudo apt-get install pepflashplugin-installer
sudo mkdir -p /opt/google/chrome/PepperFlash
sudo ln -s /usr/lib/pepflashplugin-installer/libpepflashplayer.so /opt/google/chrome/PepperFlash

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install freshplayerplugin