steps for installation

root@ubuntu:~# apt-get update
root@ubuntu:~# apt-get install default-jre
 root@ubuntu:~#sudo apt-get install default-jdk
 Oracle JDK 8:
     apt-get install oracle-java8-installer
 root@ubuntu:~# java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)
Installing Jenkins
root@ubuntu:~# wget -q -O - https://pkg.jenkins.io/debian/jenkins-ci.org.key | apt-key add -
root@ubuntu:~# echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list
 root@ubuntu:~# apt-get update
  root@ubuntu:~# apt-get install jenkins
   root@ubuntu:~# service jenkins status
   
   Configure Jenkins On The Web
   
http://localhost:8080 or http://your-ip-address:8080
You should now see a ‘Customize Jenkins’ page where you will select how to install your plugins.
Complete the required fields, and click on save and finish.