for ElementaryOS
# apt install xinetd libssl-dev build-essential
# cd /tmp; wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz
# tar zxvf linux-nrpe-agent.tar.gz
# cd linux-nrpe-agent
# vi fullinstall
(after the 4th line insert a line distro=Ubuntu)
# ./fullinstall