10.10 - Cannot save tar.gz file to usr/local

I'm using the following instruction to install and configure Hadoop on Ubuntu 10.10.

http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/#installation

I tried to save the compressed tar.gz file to /usr/local/ but it just won't save.

I've tried saving the tar.gz in my home folder and desktop and copying the files to the desired folder, but I get an error that tells me I don't have permission.

How do I save and extract a tar.gz folder to /usr/local/hadoop?

You need to be root to write to /usr/local. Run the file manager as root using

gksu nautilus

Then copy and paste or extract the archive.