jjvader, thanks for your reply.

Could you please check the following:
Do you use a proxy or have a proxy enabled in Firefox or global system settings?

For Firefox you can find proxy settings in the advanced preferences under 
networking / connection (Sorry, I don't know the spanish translation).
The global settings are in the system / settings / network proxy menu.

You could also try using a different server.
You can select the server from the software sources dialog (in the settings 
menu in Synaptic)

You could also try "wget 
http://es.archive.ubuntu.com/ubuntu/dists/feisty-backports/Release.gpg"; in a 
terminal and see whether it can retrieve the file.
(Post the result here)

Thanks for helping making Ubuntu better.

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getting upgrade prerequisites failed
https://bugs.launchpad.net/bugs/188569
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