Jenkins isn’t part of the repositories for Ubuntu 19.10 but can be easily installed after adding it. Steps below:
Download and add the key
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  | wget -q -O - https://pkg.jenkins-ci.org/debian-stable/jenkins-ci.org.key | sudo apt-key add -
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Add the repo to the sources file
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  | echo deb https://pkg.jenkins-ci.org/debian-stable binary/ | sudo tee /etc/apt/sources.list.d/jenkins.list
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Update
Install Java
1
  | sudo apt install openjdk-8-jdk
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Install Jenkins
1
  | sudo apt install jenkins
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Start the Jenkins service
1
  | sudo systemctl start jenkins
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Access the Jenkins installation via a browser at: https://:8080
Admin password
Access the admin user password as per the below
1
  | cat /var/lib/jenkins/secrets/initialAdminPassword
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