Installing hadoop in Ubuntu:

1) Download hadoop-1.0.4 from http://hadoop.apache.org/  as .tar.gz format
eg:hadoop-1.0.4-bin-tar.gz

2)User should log as root user else permission will be denied. use any extract software but i used Archive mounter. Extract in Home folder or use command in Home folder:

sushanth@sushanth-System-Product-Name:~$ls

check for home folder if not found type:

sushanth@sushanth-System-Product-Name:~$cd ..

sushanth@sushanth-System-Product-Name:/home$  
 
sushanth@sushanth-System-Product-Name:/home$  tar xvfz hadoop-1.0.4.bin.tar.gz