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[ubuntu] I cant Install Nvidia Geforce7400 (9.10)

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http://ubuntuforums.org – When i try to activate the nvidia driver from Hardware drivers or when i try to open Synaptic Package Manager it shows me this message : 'E:Type 'gpg' is not known on line 55 in source list /etc/apt/sources.list, E:The list of sources could not be read.' What should i do ? Thanks in Advance (Hardware)