Today I installed flash player 11.2 on my Ubuntu box. In the past when I've tried to install Flash Player it's been a huge mess because the instructions in the README don't work, or I don't know where the right plugins directory is so I end up copying files willy nilly into every location I find mentioned in my "flash player install linux ubuntu how to" google search until finally it works but I have no idea which was the right location.
So this time, I decided to clean up. First I deleted every file I could find that had the words flash and player in the name. Also, to make sure I didn't have Gnash (a flash player alternative) installed, I typed the following into Terminal:
sudo apt-get remove gnash*
After confirming that Flash no longer worked in Firefox and Chrome I did the following:
1. Download Flash Player from http://get.adobe.com/flashplayer. I chose the tar.gz option.
2. Extract the tar.gz package to ~/temp
3. in Terminal:
sudo cp -r ~/temp/usr/* /usr
4. One by one, tried each directory that looked like it could be a firefox plugins directory until finally found the one that worked. What finally worked was:
sudo cp ~/temp/libflashplayer.so /usr/lib64/mozilla/plugins/libflashplayer.so
Now I've got 64-bit flash player running and my filesystem is much cleaner!