Root is the super-ultra-mega. All system commands on a Linux box need to be done as root. This means installing software and changing files not in your /home directory, etc. In your terminal, if you're logged in already become root by typing su at your $ prompt, then the root password. Log in the system directly as root from a terminal, but not the graphical login. # shows root.
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If you can walk and chew gum at the same time, you can run Linux