Install_flash_player_11_linux.x86_32.tar.gz,Install_flash_player_11_linux.x86_64.tar.gz in 64/32 bit in ubuntu/linux for firefox|Installing Adobe Flash Player in 32 and 64 bi ubuntu/linux for firefox|Installing latest version of Adobe Flash Player in ubuntu for firefox|Install latest Flash Player in ubuntu/linux for firefox|Installing Adobe flash player from source file for firefox.

To install flash player in ubuntu through source file is much easier as installing from binary file. when this post was written there was no debian file available for the current version of flash player although rpm package is available but no debian package available. Usually now flash player is coming as shared library which you have to put in a specified location and firefox and other browser will pick it automatically as follows. Download the source file for your machine from "here".

Now follow these steps:
Step 1:  Using the tar utility extract the file or right click on the file and extract the file.
Step 2:   Copy the file with ".so" extension to ".mozilla/plugins" directory which is in your home directory. Here ".mozilla" will be hidden in your home directory.If there is no "plugins" folder then create and copy that file in that folder and restart the firefox.