By following the Debian installation section at page https://docs.opennms.org/opennms/releases/latest/guide-install/guide-install.html on a brand new Ubuntu 18 LTS I am getting an error after the last command, is any way to access a recent working repository rather than the broken version 23 ? Thanks in advance.
su root
cat << EOF | sudo tee /etc/apt/sources.list.d/opennms.list
deb https://debian.opennms.org stable main
deb-src https://debian.opennms.org stable main
EOF
wget -O - https://debian.opennms.org/OPENNMS-GPG-KEY | apt-key add -
apt update
apt -y install opennms