Updating Flashplayer in Debian GNU/Linux

Check for latest version

user@localhost $> sudo update-flashplugin-nonfree --status
Flash Player version installed on this system  : 11.2.202.442
Flash Player version available on upstream site: 11.2.202.451
flash-mozilla.so - auto mode
  link currently points to /usr/lib/flashplugin-nonfree/libflashplayer.so
/usr/lib/flashplugin-nonfree/libflashplayer.so - priority 50
/usr/lib/gnash/libgnashplugin.so - priority 10
Current 'best' version is '/usr/lib/flashplugin-nonfree/libflashplayer.so'.

So a new version is available. To upgrade, use following command:

user@localhost $> sudo update-flashplugin-nonfree --install
--2015-03-16 00:21:59--  https://fpdownload.macromedia.com/get/flashplayer/pdc/11.2.202.451/install_flash_player_11_linux.x86_64.tar.gz
Resolving fpdownload.macromedia.com (fpdownload.macromedia.com)... 23.72.80.8
Connecting to fpdownload.macromedia.com (fpdownload.macromedia.com)|23.72.80.8|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 7244055 (6.9M) [application/x-gzip]
Saving to: ‘/tmp/flashplugin-nonfree.tsRdJVFLnj/install_flash_player_11_linux.x86_64.tar.gz’

     0K .......... .......... .......... .......... ..........  0%  674K 10s
    50K .......... .......... .......... .......... ..........  1%  561K 11s
   100K .......... .......... .......... .......... ..........  2%  687K 11s
   150K ..........
    ........ ........ snip ....... ........
   7000K .......... .......... .......... .......... .......... 99%  548K 0s
   7050K .......... .......... ....                            100%  917K=12s

2015-03-16 00:22:11 (613 KB/s) - ‘/tmp/flashplugin-nonfree.tsRdJVFLnj/install_flash_player_11_linux.x86_64.tar.gz’ saved [7244055/7244055]

Check version again:

user@localhost $> sudo update-flashplugin-nonfree --status
Flash Player version installed on this system  : 11.2.202.451
Flash Player version available on upstream site: 11.2.202.451
flash-mozilla.so - auto mode
  link currently points to /usr/lib/flashplugin-nonfree/libflashplayer.so
/usr/lib/flashplugin-nonfree/libflashplayer.so - priority 50
/usr/lib/gnash/libgnashplugin.so - priority 10
Current 'best' version is '/usr/lib/flashplugin-nonfree/libflashplayer.so'.

Latest version installed.

In Mozilla Firefox, to check if it is using the latest version, open page about:plugins. If it is not the latest version, close Firefox completely and restart.

Reference & details see: FlashPlayer [wiki.debian.org]