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Since updating to Quantal Skype doesn't work and I get this error when updating:

W:GPG error: quantal Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F6A071ABEE5D5BA2
W:Failed to fetch  404  Not Found [IP: 80]
W:Failed to fetch  404  Not Found [IP: 80]
W:Failed to fetch  404  Not Found [IP: 80]
E:Some index files failed to download. They have been ignored, or old ones used instead.
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i think you have problem with internet connection – amrelghobary Oct 31 '12 at 14:52

Try this

sudo apt-key adv --recv-key --keyserver F6A071ABEE5D5BA2
sudo apt-get update

to correct the problem with the W:GPG error

If you search , you will not find any address like this . The address is wrong or not exist.

If you have added external PPA with this name , disable it or fully remove it. See here how.

Enable the partners repository , see here how and then search Ubuntu Software Center to install Skype correctly.

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