Since you're likely new to Linux you may not know how to update software. You don't go to the vendors website. Your Ubuntu installation has a repository where all of the software installed on your system is "registered" (in a basic explanation). The repository also contains applications which you have not installed on your system but can install it optionally.
You can update your software in the
Ubuntu Software Center. I recommend installing
Synaptic to manage your software as it's more logical.
The name package you need to update for flash is flashplugin-installer.
So that you might relate it to Windows.
Repositories contain a list of packages (both installed on your system and available for download and install).
Packages contain software (similar to Windows setup.exe installers but better).
Installing software is as easy as two clicks: 1 to select the package, 2 to install. It will seem awkward and strange at first since you're used to jumping through hoops like going to the vendors website, searching through hundreds of the vendor website links, and downloading the vendor software through your web browser, and finally once you have it downloaded you need to install it and go through a setup process.
For a more thorough and in depth explanation on Installing software in Ubuntu, Packages, and Repositories see the
Installing Software documentation on Ubuntu website.
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You could also alternatively update your flash in the terminal.
Code:
sudo apt-get update
sudo apt-get upgrade flashplugin-installer
To see more information about the package you can run the following in the terminal.
Code:
sudo dpkg-query -p flashplugin-installer
You could also update all the software on your system at once with these two commands in the terminal.
Code:
sudo apt-get update
sudo apt-get upgrade