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After upgrading to 18.04, the battery tray icon from mate-power-manager simply disappeared

As everyone can imagine, a tray icon showing the battery load level is extremely important on laptops

How can i log this issue and share information here? What else should i also try, and which alternate lightweight tools should i try that also shows a battery tray icon?

(i’m mostly using AwesomeWM, and replaced most of the Gnome3 tools with their Mate equivalents, so i would struggle a lot to use gnome-power-manager, specially if it will force me to have those whole Gnome3-related packages installed as dependency)

Thanks in advance!

guest@macbookair:~$ mate-power-manager 



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.674: Theme parsing error: gtk.css:51:14: not a number



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.674: Theme parsing error: gtk.css:51:14: Expected a string.



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.675: Theme parsing error: gtk.css:129:14: not a number



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.675: Theme parsing error: gtk.css:129:14: Expected a string.



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.679: Theme parsing error: gtk.css:845:21: not a number



(mate-power-manager:574): Gtk-WARNING **: 08:35:25.679: Theme parsing error: gtk.css:845:21: Expected a string.

TI:08:35:25 TH:0x55ef43ac5560   FI:gpm-main.c   FN:main,246

 - Power Manager is already running in this session.

Traceback:

    mate-power-manager(+0x19dff) [0x55ef433f0dff]

    mate-power-manager(+0x88a8) [0x55ef433df8a8]

    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f2879566b97]

    mate-power-manager(+0x8b0a) [0x55ef433dfb0a]

guest@macbookair:~$ 

I hit this too. In my case the power manager was missing. It didn't show up in the settings. 'sudo apt-get install mate-power-manager-common' fixed this then you have to go into the settings->power-manager-preferences->on-battery-power and select. I also did several things on the indicator-power-service to get it working but installing the power manager may have fixed this too. Look at this response on the power indicator for help on that. Where he says "OnlyShowIn=Unity;XFCE;GNOME;" you need to add "MATE;" to get the battery indicator to show up.