One of the the few things I don't like about Linux is how hard it can be to install new applications, or plugins, this can be hard if you aren't very good using Command lines and prefer using a GUI - pronounced Gooey (graphical user interface)
this instructable covers using 7.10 (gutsy gibbon) it should work with most Ubuntu distros though.
before doing this please follow This instructable, otherwise this will not work you can find it
ok first you need to go to http://www.adobe.com then click the "get flash" icon on the right hand side of the page. It should automatically detect the fact that you are using Linux and give you the correct file types.
click download, and save to disk the tar.gz file you DON'T want the .rpm or YUM files.