I've been searching for a good few hours on how to change the mouse speed on Ubuntu 14.04, but all the answers and tutorials I find only teach me how to adjust the acceleration and not the speed. I need to lower my mouse speed. I like a bit of acceleration, but my mouse base speed is too high which means it's hard to aim for small buttons. How do I adjust just the mouse speed, with either xset or xinput, or other tools? Command line solutions are preferable, because I suspect the GUI for mouse and touchpad settings in Ubuntu 14.04 is bugged. There isn't much available to tweak besides the double click speed and laterality (right or left-handed, see attached image).
