error adding MATE to Ubuntu 13.10

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http://ubuntuforums.org – Commands: Code: sudo add-apt-repository "deb http://repo.mate-desktop.org/ubuntu saucy main" sudo apt-get update Result: Quote: Fetched 1,293 kB in 58s (22.0 kB/s) Reading package lists... Done W: GPG error: http://repo.mate-desktop.org saucy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 68980A0EA10B4DE8 (Hardware)