title: Install Jenkins in Ubuntu 18.04 LTS failed (Failed to start LSB: Start Jenkins at boot time.)
body: <h2>[Symptoms]</h2>
  
  <ul>
  <li>Install Jenkins by using official steps, but failed with error message <strong>Failed to start LSB: Start Jenkins at boot time</strong>.</li>
  <li><p>Reproduce Steps</p>
  
  <pre><code>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 install jenkins
  </code></pre></li>
  <li><p>Console log</p>
  
  <pre><code>gaspar@jenkins:~$ sudo apt install jenkins
  ...
  Setting up default-jre-headless (2:1.9-62ubuntu2) ...
  Setting up jenkins (2.107.2) ...
  Job for jenkins.service failed because the control process exited with error code.
  See "systemctl status jenkins.service" and "journalctl -xe" for details.
  invoke-rc.d: initscript jenkins, action "start" failed.
  ● jenkins.service - LSB: Start Jenkins at boot time
     Loaded: loaded (/etc/init.d/jenkins; generated)
     Active: failed (Result: exit-code) since Thu 2018-04-19 10:03:05 UTC; 9ms ago
       Docs: man:systemd-sysv-generator(8)
    Process: 27282 ExecStart=/etc/init.d/jenkins start (code=exited, status=7)
  Apr 19 10:03:03 evt-jenkins systemd[1]: Starting LSB: Start Jenkins at boot time...
  Apr 19 10:03:03 evt-jenkins jenkins[27282]:  * Starting Jenkins Automation Server jenkins
  Apr 19 10:03:03 evt-jenkins su[27313]: Successful su for jenkins by root
  Apr 19 10:03:03 evt-jenkins su[27313]: + ??? root:jenkins
  Apr 19 10:03:03 evt-jenkins su[27313]: pam_unix(su:session): session opened for user jenkins by (uid=0)
  Apr 19 10:03:03 evt-jenkins su[27313]: pam_unix(su:session): session closed for user jenkins
  Apr 19 10:03:05 evt-jenkins jenkins[27282]:    ...fail!
  Apr 19 10:03:05 evt-jenkins systemd[1]: jenkins.service: Control process exited, code=exited status=7
  Apr 19 10:03:05 evt-jenkins systemd[1]: jenkins.service: Failed with result 'exit-code'.
  Apr 19 10:03:05 evt-jenkins systemd[1]: Failed to start LSB: Start Jenkins at boot time.
  dpkg: error processing package jenkins (--configure):
   installed jenkins package post-installation script subprocess returned error exit status 1
  ...
  </code></pre></li>
  </ul>
  
  <h2>[Environment]</h2>
  
  <ul>
  <li>Ubuntu 18.04 LTS Beta2</li>
  <li>Jenkins 2.107.2</li>
  </ul>