Installing Flash Player on Ubuntu

First, go to the official website and download the appropriate Flash Player package. The one I downloaded at the time was:

install_flash_player_11_linux.x86_64.tar.gz

The file was placed on the desktop.

Note: Flash Player is no longer maintained. The method below is only suitable as a reference for maintaining old systems or legacy browser environments, or for handling offline historical materials. Before using it in practice, confirm that the package comes from a trusted source, and avoid enabling old versions of Flash in an internet-connected browser whenever possible.

Extract the Installation Package

Run the following command during installation. Modify the filename and path according to the actual location on your machine:

tar xvf Desktop/install_flash_player_11_linux.x86_64.tar.gz

After extraction, you will get files such as libflashplayer.so.

Install It to the Firefox Plugin Directory

At this point, Mozilla Firefox still cannot use Flash directly. You need to copy the plugin file to Firefox's plugin directory:

mkdir -p ~/.mozilla/plugins
cp libflashplayer.so ~/.mozilla/plugins/

If the commands complete without errors, restart Firefox and open the plugin page to check whether Flash has been recognized. The plugin page address may differ between Firefox versions. You can try entering the following in the address bar:

about:addons

Or:

about:plugins

If it still does not work, first confirm that libflashplayer.so has been copied to the correct directory:

ls -l ~/.mozilla/plugins/libflashplayer.so

You can also confirm whether the system architecture matches the downloaded package:

uname -m

A 64-bit system should usually use the x86_64 package. If the system or browser version is relatively new, it may no longer support the old NPAPI Flash plugin. In that case, even if the file has been copied correctly, the browser may still not load it.

Enjoy it!