USB mouse not working properly on Ubuntu 16.04

power management switches off usb devices in order to save power after a certain period of inactivity.

Solution1:

$ sudo apt remove laptop-mode-tools  $ sudo reboot

Solution2:
 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