I'm running Ubuntu 12.04 LTS and I am recieving error message when trying to update software. Can i fix this?

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http://askubuntu.com – I am receiving this message when trying to update:- failed to fetch http://gb.archive.abuntu.com/ubuntu/pool/main/s/software-center/software... 404 not found My Internet connection is good and stable but this is preventing my updates from downloading and I would like some information which may help me resolve this problem. Thank you. p.s. I'm new to using linux OS:) (HowTos)