Install Jenkins in Ubuntu 18.04 LTS failed (Failed to start LSB: Start Jenkins at boot time.)

[Root cause]

• Ubuntu 18.04 LTS use Java 9 as default java
• Jenkins 2.107.2 still use Java 8

[Solution]

• Install Java 8 before install Jenkins

  sudo add-apt-repository ppa:webupd8team/java
  sudo apt install oracle-java8-installer
  wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
  sudo apt-add-repository "deb https://pkg.jenkins.io/debian-stable binary/"
  sudo apt-get update
  sudo apt install jenkins
  

1. Install java 8

sudo apt install openjdk-8-jre

2. Set default java version as java 8

sudo update-alternatives --config java

3. Add the key

wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -

4. Add repository

sudo apt-add-repository "deb https://pkg.jenkins.io/debian-stable binary/"

5. Install jenkins

sudo apt install jenkins