Flash-Aid is an extension designed to remove conflicting flash plugins from Ubuntu Linux systems and install the appropriate version according to system architecture.
First off, your going to need these files.
Third, place the two files into the folder you just made.
Fourth, open Main Menu (Under Settings). Open the games tab, and click New Item.
Set the name to "Minecraft".
Fill in Command with "java -jar minecraft.jar".
For Working Directory, click the browse button, and navigate to the .minecraft folder you made.
Remember, to see the .minecraft folder you need to press Ctrl-H.
Fifth, click the icon button, and select icon from image files.
Navigate to the .minecraft folder, and select favicon.png.
Then click OK.
Click save, and thats it! You can now open Minecraft from your games menu.