cannot install cinnimon 2.xx
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                user207587
            
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        Published on 2013-10-26T15:30:21Z
        Indexed on 
            2013/10/26
            16:08 UTC
        
        
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Fetched 841 kB in 28s (29.3 kB/s)
W: GPG error: http://packages.mate-desktop.org raring Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 68980A0EA10B4DE8
W: Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/raring/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
userx@bw:~$ 
How do I fix that?
How do I add a PUBKEY to get needed files to complete install of Cinnamon? 
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