I am running Ubuntu GNOME 15.10 with GNOME 3.18, and there is one thing lacking, a power monitor tool which will display the status, the one in Ubuntu MATE looks like this:
Ubuntu (Unity) also has a similar one, but I can't seem to find one installed by default on Ubuntu GNOME, so is there one that I just haven't found or one that I can install that's made for GNOME, or is not DE specific?
2 Answers
You can find the following power managers in the Ubuntu repositories :
gnome-power-manager mate-power-manager xfce4-power-manager
These power managers have the design as shown in your screenshots.
Alternatively you can install the powertop tool from the repositories.
PowerTOP is a Linux tool to diagnose issues with power consumption and power management. It reports which components in the system are most likely to blame for higher-than-needed power consumption, ranging from software applications to active components in the system. Detailed screens are available for CPU states, device activity and software activity.
Additional information -> Intel Open Source PowerTOP Overview | PowerTOP User's Guide
Tecmint -> PowerTOP Monitors Total Power Usage and Improves Linux Laptop Battery Life
The Unity tool is likely from GNOME: gnome-power-statistics. The package is named gnome-power-manager, and I think the MATE version is called mate-power-statistics (and mate-power-manager).

