Refer: https://www.fossmint.com/stacer-ubuntu-system-optimizer/
--------------- On Ubuntu 64-bit ---------------
$ wget https://github.com/oguzhaninan/Stacer/releases/download/v1.0.4/Stacer_1.0.4_amd64.deb
$ sudo dpkg --install Stacer_1.0.4_amd64.deb
$ Stacer