The Elementary OS Luna – Ubuntu 12.04 Precise based system – comes with lightweight browser Midori. To get Flash working for it, you’ll need to install ndiswrapper and do some tweaking. It’s not difficult, just folow the below steps, copy and paste commands into terminal and hit enter to run.

1.) To get started, press Ctrl+Alt+T on your keyboard to open terminal. When it opens, run command to install the flashplugin-installer.

sudo apt-get install flashplugin-installer nspluginwrapper

2.) Then run below commands one by one to get the flash working.

sudo nspluginwrapper -i /usr/lib/flashplugin-installer/libflashplayer.so

nspluginwrapper -v -a -n -i

That’s it. Restart your browser and enjoy!

UPATE: As KW said, if previous commands does not work, just move the libflashplayer.so file to the /usr/lib/mozilla/plugins folder