INDI Library is available for Raspbian Buster. To install stable INDI Library, run the following commands:
wget -O - https://www.astroberry.io/repo/key | sudo apt-key add - sudo su -c "echo 'deb https://www.astroberry.io/repo/ buster main' > /etc/apt/sources.list.d/astroberry.list" sudo apt update
After update is complete, you can install INDI and optionally Ekos:
sudo apt install indi-full gsc
sudo apt install indi-full kstars-bleeding
sudo apt install libindi1 indi-bin
If you receive an error about some package trying to overwrite another, try this:
sudo apt-get -o Dpkg::Options::="--force-overwrite" -f install