Comment 90 for bug 28052

Okay, this bug should be closed. It's not even relevant anymore.
But the new control center is still missing the option to set the acceleration properly. (There is none.)

$ xset m 0 0
will fix this.

I have found a way to make this auto-start each boot:

1) Open up a terminal and type:

#!/bin/bash
xset m 0 0

Save the file in your home folder as “mouse.sh” or anything. Just make it end with “.sh”.

2) Let’s make this file executable.
chmod +x ~/mouse.sh

3) Let’s make Ubuntu run it automatically at each boot!
Open up the application called “Startup Applications”, and add a new one.
Name: whatever you want.
Command: ~/mouse.sh

( Source that I found through Google: http://blog.repa.info/2013/06/14/how-to-disable-mouse-acceleration-in-ubuntu-or-any-other-linux/ )