How to install Adobe Flash Player 10 on Ubuntu Linux

Here is a simply way operated on terminal to install Flash 10:

Step 1: Download getlibs from http://ubuntuforums.org/showthread.php?t=474790 and install_flsh_player_10_linux.tar.gz from Adobe website
Note: save them on Desktop

Step 2: Remove old plugins

sudo apt-get -y purge nspluginwrapper
sudo apt-get -y purge mozilla-plugin-gnash
sudo apt-get -y purge swfdec-mozilla
sudo rm -rfd /usr/lib/nspluginwrapper
sudo rm -f /usr/lib/firefox-addons/plugins/libflashplayer.so
sudo rm -f /usr/lib/mozilla/plugins/flashplugin-alternative.so
sudo apt-get purge flashplugin-nonfree
sudo rm -f /usr/lib/firefox-addons/plugins/libflashplayer.so
sudo rm -f
/usr/lib/nspluginwrapper/plugins/npwrapper.libflashplayer.so

Step 3: Install getlibs

cd ~/Desktop
sudo apt-get -y install nspluginwrapper
sudo dpkg -i getlibs-all.deb
sudo getlibs -p libcurl3
sudo getlibs -p libnss3-1d
sudo getlibs -p libnspr4-0d

Step 4: Install Flash plugin

tar -xzvf install_flash_player_10_linux.tar.gz
sudo mv -f ~/Desktop/libflashplayer.so
/usr/lib/firefox-addons/plugins/

Step 5: Wrap and Link

sudo nspluginwrapper -i /usr/lib/firefox-addons/plugins/libflashplayer.so
sudo ln -s /usr/lib/nspluginwrapper/plugins/npwrapper.libflashplayer.so
/usr/lib/firefox-addons/plugins/

Step 6: Restart browser and you are good to go!

Reference: http://ubuntuforums.org/showthread.php?t=772490