I installed jenkins - it didn't start. /var/log/jenkins/jenkins.log is empty No messages in syslog related to jenkins The service is stuck in stop/waiting state: root@Ivy:~# service jenkins status jenkins stop/waiting root@Ivy:~# service jenkins stop stop: Unknown instance: root@Ivy:~# service jenkins start jenkins start/running, process 2052 root@Ivy:~# service jenkins stop stop: Unknown instance