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I am trying to install hadoop on ubuntu using this tutorial

I have changed all the conf files and tried every solution available on the internet. I dont get any error when i run but when i use jps to check for processes, I get this:->

3132 Jps
2742 SecondaryNameNode
2830 JobTracker

when I use, I get:->

stopping jobtracker
localhost: no tasktracker to stop
no namenode to stop
localhost: no datanode to stop
localhost: stopping secondarynamenode

this is my jobtracker log pls help me out:

Problem connecting to HDFS Namenode... re-trying Call to localhost/ failed on connection exception: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(
    at com.sun.proxy.$Proxy7.getProtocolVersion(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(
    at java.lang.reflect.Method.invoke(

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