I have a Pi 3b+ and had been running libreelec for a couple years now and have been really happy with it. I just added a Pi Sugar 2 battery board and that's where my problems started. The Pi Sugar has an install script that installs a web interface to be able to see the battery level, and to be able to set the actions of a programable button (shutdown, reboot...). But when I SSH to libreelec, I can't seem to do much of anything in the terminal. No "apt install..." no "yum" no "snap"... I'm not a linux guru by any means and I know that libreelec is "just enough linux for kodi", but I feel like there has to be a way to expand the functionality to install other things in the background. Any help would be much appreciated.
I tried switching to Raspberry OS and just installing Kodi on that, but I had performance issues doing that (putting that question in a separate thread).