The mouse is too fast however in settings I cannot reduce the mouse speed at all, as it is already all the way to the left. I've had this problem with this computer forever and it's a real nuisance. Probably need to report it as a bug?
The real cure is I have a 2008 Compaq desktop with Windows 7 on 1 hard drive and Ubuntu 16.04 on another. When I first installed Ubuntu the mouse was so fast Even moving the mouse speed slider all the way to slow did not help.
After searching out the fix I got all this info. First open the terminal, and type
xinput --list --short. This brings up virtual core pointer. In the top section will see your mouses name (mine is YESTEK G Mouse) id=8 write down your mouses id # only (8) save ! now in terminal, type
xinput --list-props 8 your mouses id #. push enter and look for Device Accel Constant Deceleration write # behind your mouse id # mine was (270) so 8 270 then behind those you need a # from 2 to 8 (lower # faster movement Higher # slower movement) Now in terminal type
xinput --set-prop 8 270 6 push enter this will slow your mouse way down if to slow re-enter
xinput --set-prop 8 270 5 keep changing last # till you like the speed and you can use system setting, mouse & Touchpad speed slider for fine tuning speed. Hope this helps!
These settings will only stay till you restart so keep them wrote down if you know how to save them to start-up Find the Startup Applications Preferences app Open it then save the settings you like by clicking add on the right and on the small form give your settings a name I used mouse speed, in command type
xinput --set-prop 8 270 6 click the add button on small form.
Next startup thell be working at startup.