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I installed java default packages in Ubuntu 18.04 and tried to install Jenkins. When this did not work I searched for reasons for this and found that Jenkins needs Java 8 and the default Java in Ubuntu 18.04 is Java 10.

So, I removed all the files of Java from /usr/lib/jre folder and tried to install Java 8. It says they are already installed without downloading packages and when I tried to verify the version it said JAVA NOT FOUND.

How could I solve this issue?

Zanna
  • 72,312
Harsha Mucherla
  • 11

2 Answers2

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Why to install and make it complicated?

Instead of installing Jenkins using package manager sudo apt install, a better option is run Jenkins as war.

  1. Download the latest stable Jenkins WAR file to an appropriate directory on your machine.
  2. Open up a terminal/command prompt window to the download directory.
  3. Run the command java -jar jenkins.war.
  4. Browse to http://localhost:8080 and wait until the Unlock Jenkins page appears.

By default Jenkins runs on port 8080, change port using java -jar jenkins.war --httpPort=9090

To keep jenkins running on Ubuntu even after terminal is closed, use

nohup java -jar jenkins.war --httpPort=9090 &

See Installing Jenkins for more options.

r_D
  • 151
0

I had the same issue.

Info in repositories is not right.

If you follow logs you'll find the version you're installing is an archive. For me it was u191 today: 2019/01/16 but on website it's u201 or u202.

you have to change your repo info like this:

cd /var/lib/dpkg/info
sudo sed -i 's|JAVA_VERSION=8u191|JAVA_VERSION=8u201|' oracle-java8-installer.*
sudo sed -i 's|PARTNER_URL=http://download.oracle.com/otn-pub/java/jdk/8u191-b12/2787e4a523244c269598db4e85c51e0c/|PARTNER_URL=https://download.oracle.com/otn-pub/java/jdk/8u201-b09/42970487e3af4f5aa5bca3f542482c60/|' oracle-java8-installer.*
sudo sed -i 's|SHA256SUM_TGZ="53c29507e2405a7ffdbba627e6d64856089b094867479edc5ede4105c1da0d65"|SHA256SUM_TGZ="cb700cc0ac3ddc728a567c350881ce7e25118eaf7ca97ca9705d4580c506e370"|' oracle-java8-installer.*
sudo sed -i 's|J_DIR=jdk1.8.0_191J_DIR=jdk1.8.0_201|' oracle-java8-installer.*

Information is on Oracle's download website.

See answers to Can't install Oracle Java 8 in Ubuntu 16.04

Zanna
  • 72,312
Climberdav
  • 1