My battery tray icon indicator suddenly disappeared:

I didn't install or remove any software.

I'm using Ubuntu 15.10.

1 Answer

Try reinstalling indicator-power

sudo apt-get install indicator-power

Other possiblity is that it is disabled in the gnome registry

sudo apt-get install indicator-applet-complete
sudo apt-get install dconf-editor

Then use dconf-editor to change icon-policy to present.