How can I change the alt+middle-mouse-button resize to alt+right-mouse-button?

Follow these steps:

• To open dconf-editor, Hit Alt+F2, type dconf-editor and hit Enter.

• In dconf-editor goto: org ➤ gnome ➤ desktop ➤ wm ➤ preferences and enable ☑ resize-with-right-button.

  

1. You need to get and install ccsm (Compiz Config Settings Manager).

   sudo apt-get install compizconfig-settings-manager
   

2. Go to Window Management --> Resize window .

   

Note: Changing Button2 to Button3 or 1 may give you a conflict message. If so, choose "Disable Window Menu". However, Alt+F8 Will give you the same result.

You can do this using compizconfig-settings-manager.

If you dont already have this installed, use Software Center and search for this package.

In dash type ccsm and then in the Window Management section click on "Resize Window".

At the bottom of this window is "Initiate Window Resize" - you'll notice that Button2 is the default. You can change this to whichever button you want.