If you have a .tar.gz ending of the file, type tar xvfz filename. If this is Fedora or RedHat or the likes, then you install it with something like yum. sudo (or su, enter, *type in root password*) yum install filename
you can't have permission to enter /root even as a superuser, root is a separate user, su is a normal user with root privileges. try entering as root, you won't have much trouble with anything then.
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