I have a Lenovo Y710 laptop that is running Ubuntu 16.04, my mouse is the Logitech marathon M705. I'm running a fresh boot and have been going over basic settings. This is my first time using Linux. I don't like mouse acceleration, as there is no option in the settings to disable it I found the below solution on the internet.

I typed:

sudo gedit /usr/share/X11/xorg.conf.d/90-mouse.conf

into a terminal and ran the below code.

Section "InputClass"
Identifier "mouse"
MatchIsPointer "on"
Option "AccelerationProfile" "-1"
Option "AccelerationScheme" "none"

I restarted, mouse acceleration was off, I could change the speed of the touchpad, but I could not change the speed of my physical mouse. The slider worked and moved from slow to fast, but the mouse speed remained static at a relatively slow speed.

How do I fix this?

Try your preferred setting whit this command:

 xinput set-prop 'mouse' 279 0.9

You can change the 0.9 to a value from 0.0 to 1.0 (higher is faster).

After you found your preferred setting, make it permanent by adding the a line like

 Option  "Accel Speed" "0.9"

to the config file you edited before. Place it directly before the line "EndSection".

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