If you alread have java installed on your machine, you may skip this step.
Otherwise, let's continue and install java 8.
sudo apt update
sudo apt install openjdk-8-jdk
The default Ubuntu packages for Jenkins are always behind the current version of the project itself. You may use the project-maintained packages to install Jenkins to take advantage of the newest patches and features.
wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add
The device returns OK when the key is inserted.
sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins
sudo systemctl status jenkins
