1. Download Flash Player from here. Download .tar.gz extension one.
2. Open terminal, and do following command:
Command :
red-dragon [~] → cd Downloads
Command :
red-dragon [~/Downloads] → tar -xf install_flash_player
Command :
red-dragon [~/Downloads] → cp libflashplayer.so /usr/lib/chromium/plugins
And do restart your chromium-browser.
Voila!