Unable to start sonarqube after installation

I installed sonarqube from Download | SonarQube Developer edition.
After following the process as given in Install the Server | SonarQube Docs I am unable to start Sonarqube.
I give ./sonarsube start it says sonarqube started but later when I browse localhost:9000 I dont find it i.e sonarqube is not started.
I have installed it on ubuntu 16.04,intel i5 processor.

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