1) Add the backports repository by editing /etc/apt/sources.lst (must be root) and adding the following line:
deb http://www.backports.org/debian/ lenny-backports main contrib non-free
Run the following:
#aptitude update #aptitude install debian-backports-keyring
(Ignore any warning that occur with the above 2 commands, the install will correct those) If you run #aptitude update again the warnings should be gone
2) Install Adobe Flash
#aptitude install flashplugin-nonfree
3)You shouldn't need this step, but just in case run
and make sure the correct one (/usr/lib/flashplugin-nonfree/libflashplayer.so) is selected. It should be the current default.
4) Start Iceweasel and go the location about:plugins and you should see the latest Flash.