title: Mongodb not able to start in Ubuntu 15.04
body: <p>I have installed MongoDB 3.0.6 in Ubuntu 15.04 using the following commands.</p>
  
  <pre><code>sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
  echo "deb http://repo.mongodb.org/apt/debian wheezy/mongodb-org/3.0 main" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list
  sudo apt-get update
  sudo apt-get install -y mongodb-org
  </code></pre>
  
  <p>In the end in the installation process I got this:</p>
  
  <pre><code>Job for mongod.service failed. See "systemctl status mongod.service" and "journalctl -xe" for details.
  invoke-rc.d: initscript mongod, action "start" failed.
  dpkg: error processing package mongodb-org-server (--configure):
  subprocess installed post-installation script returned error exit status 1
  Setting up mongodb-org-mongos (3.0.6) ...
  Setting up mongodb-org-tools (3.0.6) ...
  dpkg: dependency problems prevent configuration of mongodb-org:
  mongodb-org depends on mongodb-org-server; however:
  Package mongodb-org-server is not configured yet.
  
  dpkg: error processing package mongodb-org (--configure):
  dependency problems - leaving unconfigured
  No apport report written because the error message indicates its a followup error from a previous failure.
  Processing triggers for systemd (219-7ubuntu6) ...
  Processing triggers for ureadahead (0.100.0-19) ...
  Errors were encountered while processing:
  mongodb-org-server
  mongodb-org
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  </code></pre>
  
  <p>After that when I start the server using the below command I get an error and the server is not started.</p>
  
  <pre><code>sudo service mongod start
  </code></pre>
  
  <p>And the error is</p>
  
  <pre><code>Job for mongod.service failed. See "systemctl status mongod.service" and "journalctl -xe" for details.
  </code></pre>
  
  <p>Now when I run: </p>
  
  <pre><code>sudo systemctl status mongod.service
  </code></pre>
  
  <p>I get the following:</p>
  
  <pre><code>mongod.service - LSB: An object/document-oriented database
  Loaded: loaded (/etc/init.d/mongod)
  Active: failed (Result: exit-code) since Thu 2015-10-08 13:46:08 IST; 22s ago
  Docs: man:systemd-sysv-generator(8)
  Process: 6604 ExecStart=/etc/init.d/mongod start (code=exited, status=1/FAILURE)
  
  Oct 08 13:46:07 gariya-GA-A55M systemd[1]: Starting LSB: An   object/document-oriented database...
  Oct 08 13:46:07 gariya-GA-A55M mongod[6604]: * Starting database mongod
  Oct 08 13:46:08 gariya-GA-A55M mongod[6604]: ...fail!
  Oct 08 13:46:08 gariya-GA-A55M systemd[1]: mongod.service: control process exited, code=exited status=1
  Oct 08 13:46:08 gariya-GA-A55M systemd[1]: Failed to start LSB: An  object/document-oriented database.
  Oct 08 13:46:08 gariya-GA-A55M systemd[1]: Unit mongod.service entered failed state.
  Oct 08 13:46:08 gariya-GA-A55M systemd[1]: mongod.service failed.
  </code></pre>
  
  <p>Someone please help, I am new to Ubuntu and MongoDB and I am not getting what is the problem.</p>