HOWTO : Adobe Flash 10.3 on Back|Track 5

Step 1 :

Go to Flash official site to download current version (tar.gz). It is 10.3.181.34 at the time of this writing.

Step 2 :

Close all running Firefox.

Extract the file "install_flash_player_10_linux.tar.gz".

tar -xvzf install_flash_player_10_linux.tar.gz

Step 3 :

Move the "libflashplayer.so" to its locations.

chown root:root libflashplayer.so
chmod 0644 libflashplayer.so
mv -f libflashplayer.so /usr/lib/mozilla/plugins/
ln -s /usr/lib/mozilla/plugins/libflashplayer.so /usr/lib/firefox/plugins/

Step 4 :

Delete the extracted files and directories.

rm -R usr

Source :

Backtrack 5 - How to get flash player working on Gnome / KDE x64

That's all! See you.