How to install Stacer on Ubuntu - h2smedia/HowTo GitHub Wiki
Here we are using Ubuntu 18.04 but the steps given here are compatible with previous versions too such as Ubuntu 17.04, 160.4, 15.04...
Add the Stacer repository
sudo add-apt-repository ppa:oguzhaninan/stacer
Update the system.
sudo apt-get update
**Install the Stacer **
sudo apt-get install stacer
Refernece: https://www.how2shout.com/how-to/install-stacer-ubuntu-terminal-ubuntu-activity-monitor-cleaner.html