In Ubuntu the edge of windows for resizing is quite sensitive and thin.
But there is an easier way to resize windows ~
just like you can move windows around by holding Alt and draging the window with your left mouse button – you can do the same with your right mouse button to resize the window.
Install Compiz – then do this:
Alt+F2 (run program) -> type ‘gconf-editor’ -> click to directories: apps -> metacity -> general -> ‘resize_with_right_button’ tick the checkbox
And that’s it ~