system-monitor.md

Glances

    sudo apt-get install glances

Htop (Suggest)

    sudo apt-get install htop

libstatgrab6

    sudo apt-get install libstatgrab6

Saidar

    sudo apt-get install saidar

indicator-...

    sudo apt-get install indicator-cpufreq
    sudo apt-get install indicator-weather
    
    sudo add-apt-repository ppa:fossfreedom/indicator-sysmonitor  
    sudo apt-get update
    sudo apt-get install indicator-sysmonitor
    ...