Adobe Flash Player ダウンロードにアクセス
http://get.adobe.com/jp/flashplayer

落とす

2.tarコマンドで展開する
先にflashplayerの.tar.gzを解凍するためのフォルダを作っておく
mei@mei-Lenovo-G570:~$ mkdir flashplayer
mei@mei-Lenovo-G570:~$ mkdir flashplayer/150718

ダウンロード時に保存されたフォルダから、先ほど作ったフォルダへ.tar.gzを移動
mei@mei-Lenovo-G570:~$ cp ./downloads/install_flash_player_11_linux.i386.tar.gz ./develop/flashplayer/150718

移動して解凍
mei@mei-Lenovo-G570:~$ cd ./develop/flashplayer/150718
mei@mei-Lenovo-G570:~/develop/flashplayer/150718$ tar xvzf ./downloads/install_flash_player_11_linux.i386.tar.gz

これらが出てくる
・usrディレクトリ
・libflashplayer.so
・readme.txt

3.readme.txtを読む
Installation instructions
-------------------------

Installing using the plugin tar.gz:
    o Unpack the plugin tar.gz and copy the files to the appropriate location. 
    o Save the plugin tar.gz locally and note the location the file was saved to.
    o Launch terminal and change directories to the location the file was saved to.
    o Unpack the tar.gz file.  Once unpacked you will see the following:
        + libflashplayer.so
        + /usr
    o Identify the location of the browser plugins directory, based on your Linux distribution and Firefox version
    o Copy libflashplayer.so to the appropriate browser plugins directory.  At the prompt type:
        + cp libflashlayer.so <BrowserPluginsLocation>
    o Copy the Flash Player Local Settings configurations files to the /usr directory.  At the prompt type:
        + sudo cp -r usr/* /usr