You should only need to create a key once, unless you change to another system, or you think your private key was compromised. (Note that "change to another system" includes each new Sugar-on-a-Stick USB drive.) If you do it again, you must also add the new key to Gitorious as described in the next section.
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You should only need to create a key once, unless you change to another system, or a different Sugar-on-a-Stick drive, or you think your private key was compromised. If you do it again, you must also add the new key to Gitorious as described in the next section.