It seems you were trying to run something like "sudo hadoop ..." as user hduser. I don't think you'd need sudo in this case.

I believe if you follow the instruction carefully, you should be able to do
hduser@UBUNTOBOX:~$ /usr/local/hadoop/bin/hadoop dfs -ls /usr

If you this works for you, then try moving files around.

hi Naveen,

If you are trying to install Hadoop on Ubuntu. Then the hadoop tarball can be downloaded , extracted in the hduser homedirectory. No need to move to "/usr" diretories.

For logging into root the password will be "password".

Thanks