Grab the Puppetlabs release package (this will set up the Puppetlabs repository):

Debian/Ubuntu: wget "https://apt.puppet.com/puppet-release-$(lsb_release -cs).deb"

RHEL and clones: . /etc/os-release; wget https://yum.puppet.com/puppet-release-el-${VERSION_ID%.*}.noarch.rpm"

Install the package:

Debian/Ubuntu: dpkg -i puppet-release-$(lsb_release -cs).deb"

RHEL and clones: rpm -i puppet-release-el-${VERSION_ID%.*}.noarch.rpm"

Install the Puppet Server package:

Debian/Ubuntu: apt update && apt install -y puppetserver

RHEL and clones: dnf updateinfo && dnf install -y puppetserver