sudo /etc/init.d/jenkins start not working

I had installed jenkins and builds were working fine.

Suddenly it stopped working. There is nothing in logs

I tried starting it, with the following command :-

sudo /etc/init.d/jenkins start

but still it’s not running

root@localhost:$# service jenkins restart
 * Restarting Jenkins Continuous Integration Server jenkins [ OK ] 

root@localhost:$# service jenkins status
Jenkins Continuous Integration Server is not running

After some googling I was able to get to run jenkins with the foll command :-

-Djava.awt.headless=true -jar /usr/share/jenkins/jenkins.war –webroot=/var/cache/jenkins/war –httpPort=8080

Still not able to get why the conventional Jenkins start command is not working. I’m working on ubuntu 14.04 version. So maybe there is some issue with Jenkins-Linux combination. To get it working is enough for the time being!