echo "GEEKSONATOR_TELEGRAM_BOT_TOKEN=\"bot_token_here\"" >> /etc/geeksonator.conf
sudo chmod 755 /opt/geeksonator
sudo cp geeksonator.service /lib/systemd/user
sudo systemctl enable /lib/systemd/user/geeksonator.service
sudo service geeksonator start
Also, the bot must disable Privacy mode (in BotFather) before being included in groups (otherwise it will not have access to messages to do reply)
export GEEKSONATOR_TELEGRAM_BOT_TOKEN="bot_token_here"
/opt/geeksonator -debug