You can take a look at:
http://askubuntu.com/questions/371872/how-come-i-cannot-adjust-mouse-sensitivity-on-ubuntu-13-10/417666#417666
You can take a look at:
http:// askubuntu. com/questions/ 371872/ how-come- i-cannot- adjust- mouse-sensitivi ty-on-ubuntu- 13-10/417666# 417666