Install gkrellm-cpufreq by entering the following commands in the terminal:
sudo apt update sudo apt install gkrellm-cpufreq
Description:
CPU frequency plugin for GKrellM
gkrellm-cpufreq is an additional plugin for GKrellM that allows one to view and set the CPU clock frequency. It also displays the currently active CPU gouverner which has been set for cpufreq such as on-demand, performance and powersave. The plugin is very useful when using tiling window managers such as awesome together with GKrellM.
Homepage: http://chw.populus.org/rub/7
Version: 0.6.4-4
Section: universe/x11