You can use commands below to install Jenkins on Debian Stretch (9).

Installation

$ sudo apt update
$ sudo apt install default-jre
$ wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
$ sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
$ sudo apt update

#jenkins #linux #debian stretch