Install Flash Plugin
To install the Adobe Flash plugin open up a terminal and type su – root and enter your password.
Now open up your sources.list file in nano by typing
sudo nano /etc/apt/sources.list.
Add the words as follows:
# jessie-updates, previously known as ‘volatile’
deb http://ftp.uk.debian.org/debian/ jessie-updates main contrib non-free
deb-src http://ftp.uk.debian.org/debian/ jessie-updates main contrib non-free
Save the file by pressing CTRL and O and then exit by pressing CTRL and X.
Update your repositories by typing apt-get update and then install the Flash plugin by typing
sudo apt-get install flashplugin-nonfree