Did you try adding the command in the terminal as suggested with "sudo" at the beginning?
Originally Posted by rootytooty
If I have to put a user in the root----how do I do that.
You already have a user "in the root", that's your main user.
Some higher level actions need to be run under sudo. That raises the level you are running at to root (with your main user passwd).
If I remember right Ubuntu tries to be windows like in helping new users do the change over to a Linux environment. Other Distros are more upfront in making it clear about a root account and users accounts.
Do the suggestion from above and when prompted give your main user passwd.
Flash install is sytem wide change and should be @ root level, therefore it's sudo.
Did you use the Ubuntu Software Centre install facility from your own menus or go straight to adding commands in the terminal?