Ubuntu has the ability to manipulate the various desktop components. One such addition that is useful is to get mini-system monitors on the clutter bar.
$ sudo apt-get install --yes gir1.2-gtop-2.0 gir1.2-networkmanager-1.0 gir1.2-clutter-1.0
Click on the application button.
Search for and launch Ubuntu Software
Search for ‘system monitor extension’
Choose the one that states "Display system informations"
[Note, that is not a mis-type in this document…”informations” is what you want]
Click the Install buttons on both prompts
Upon install, the indicator applet will immediately show upon install.
Right click the applet to show drop-down menu, then go to Preferences and change the applet appearance for color if you desire. It is suggested to add Disk access.