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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 start-all.sh but when i use jps to check for processes, I get this:->

3132 Jps
2742 SecondaryNameNode
2830 JobTracker

when I use stop-all.sh, 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
java.net.ConnectException: Call to localhost/127.0.0.1:54310 failed on connection exception: java.net.ConnectException: Connection refused
    at org.apache.hadoop.ipc.Client.wrapException(Client.java:1142)
    at org.apache.hadoop.ipc.Client.call(Client.java:1118)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229)
    at com.sun.proxy.$Proxy7.getProtocolVersion(Unknown Source)
    at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85)

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