Install Jenkins on Ubuntu 18.04 Bionic Beaver Linux - LinuxConfig.org

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The objective is to install Jenkins on Ubuntu 18.04 Bionic Beaver Linux. To start, first add Jenkins's signing key and repository using the below commands:
This is a companion discussion topic for the original entry at https://linuxconfig.org/install-jenkins-on-ubuntu-18-04-bionic-beaver-linux
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Jay Lawrence

Ubuntu server 18.04 defaults openjdk 9 which Jenkins does not want.

Prior to installing Jenkins you should:

$ sudo apt-get install openjdk-8-jdk

If you have already tried to install Jenkins and it pulled in JDK 9. Then install the JDK above and then select JDK 8 using:

$ sudo update-alternatives --config java

choose the line for jdk 8 which was 1 in my case.

see Debian Jenkins Packages for more info

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totolafripouillleeee -> Jay Lawrence

Thanks, it helped me !

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  1. It should be noted that currently Ubuntu 18.04 Bionic Beaver comes out of the box with OpenJDK 10 by default.
  2. It should also be noted that by default Ubuntu 18.04 Bionic Beaver Server does not have the universe repository enabled (which is where OpenJDK 8 resides).

So:

  1. In order to enable universe repository execute:

add-apt-repository universe
apt-get update

  1. Then install OpenJDK 8 (I install headless cuz its a server):

apt-get install openjdk-8-jdk-headless

  1. Either point all Java alternatives to OpenJDK

update-java-alternatives -s java-1.8.0-openjdk-amd64

           Or just the java

update-alternatives --config java

Then follow the above article.

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