Everything was going fine but after updating my system by
sudo apt-get update
My USB mouse is not working like before. I tried on various port and other bluetooth mouse too but still the result is the same.
NB: My touchpad is working fine and laptop model is ASUS i7.
In my case, I have solved my problem with this solution : https://askubuntu.com/a/743481/332166
This happens because the power management switches off usb devices in order to save power after a certain period of inactivity. Although there are solutions to solve this manually I recommend to install software called tlp.
$ sudo add-apt-repository ppa:linrunner/tlp
$ sudo apt-get update
$ sudo apt-get install tlp
$ sudo tlp start
