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This link works for Ubuntu 10 How can I do this in Ubuntu 12.10 because its different in Ubuntu 12.10.

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Can you please mention what you've done already and what makes you think there is a difference? That should help the community provide targeted answers. – recluze Nov 24 '12 at 13:04

Using the command-line to publish your key you can run,

gpg --keyserver --send-keys yourkeyID

and then you should get the following notification:

gpg: sending key yourkeyID to hkp server

You can check it is present on the server by running the command given in this article:

You can also use the gui program, Seahorse, to manage your keys, which is the 'Passwords and Encryption Keys' program mentioned in the link you quoted, although you might have to install it now.

A more recent gpg tutorial is available at Ubuntu help, which goes through in some detail how to create, publish, and backup your GPG keys.

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