I've never actually needed to modify the mouse scroll wheel speed until recently, when I got a new mouse and I wanted to change the scroll wheel settings. That's when I noticed there's no such option in Unity / GNOME Control Center.
I searched for ways to change this under Linux and the easiest to use seems to be "imwheel", a command line tool that can be used to tweak the mouse wheel behavior and which, among others, can change the scroll speed of the mouse wheel, and I decided to share the information with you.
Here's what you need to do to change the scroll speed of the mouse wheel if your desktop environment doesn't have an option for this:
1. Install imwheel. Since the app is available in the official Ubuntu repositories, you can install using Synaptic, Ubuntu Software Center, etc. or use the following command to install it:
sudo apt-get install imwheel2. Next, create a file called ".imwheelrc" in your home directory - I'll use Gedit in the command below to open this file:
gedit ~/.imwheelrcAnd in this file, paste the following:
".*" None, Up, Button4, 3 None, Down, Button5, 3 Control_L, Up, Control_L|Button4 Control_L, Down, Control_L|Button5 Shift_L, Up, Shift_L|Button4 Shift_L, Down, Shift_L|Button5"3" at the end of lines two and three represent the number of lines to scroll ("3" should be default) - modify this number to suit your needs. Once you're done, save the file.
Read full article from How To Change The Mouse Scroll Wheel Speed In Linux Using imwheel [Quick Tip] ~ Web Upd8: Ubuntu / Linux blog
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