Ubuntu Mate - Mouse wheel speed
Install imwheel first:
sudo apt install imewheel
Download this script thanks to @victoor
Give permissions and run:
sudo chmod +x mousewheel.sh && sudo sh mousewheel.sh
Set your mousew wheel speed (7 for example) and click apply.
If previous and next mouse buttons doesn’t work correctly add imwheel -b "4 5"
sudo imwheel -b "4 5"