sudo update-flashplugin-nonfree --install

sudo update-flashplugin-nonfree  --status
Flash Player version installed on this system  : 11.2.202.616
Flash Player version available on upstream site: 11.2.202.621
flash-mozilla.so - auto mode
  link currently points to /usr/lib/flashplugin-nonfree/libflashplayer.so
/usr/lib/flashplugin-nonfree/libflashplayer.so - priority 50
Current 'best' version is '/usr/lib/flashplugin-nonfree/libflashplayer.so'.