jenkins on unbuntu 18.04 in gcp

create an instance in gcloud

you need java

sudo apt install openjdk-8-jre-headless

then following these commands

wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update
sudo apt-get install jenkins

startup

sudo /etc/init.d/jenkins start