Hi pajzinka LibreELEC does not have an apt-get function. You can add addons through Kodi. If you are looking to develop or compile a custom LibreELEC- the follow link from the wiki will get you started. https://wiki.libreelec.tv/development-1/build-basics
Hi @heitbaum, I was hoping for something more qick-and-dirty ... imagine you have nervous wife and 2 little anoying kids behind your back