apt - Unable to update anything; GPG error - Ask Ubuntu


this first time i've ever posted forum, bear me. might add i'm new ubuntu. far, it's stressful. haven't given up. ok i'm running 13.04 , upgrade, can't seem update manager work. when run

sudo apt-get update

i back

get:1 http ://extras.ubuntu. com raring release.gpg get:2 http ://extras.ubuntu. com raring release ign http ://extras.ubuntu. com raring release e: gpg error: http ://extras.ubuntu. com raring  release: following signatures invalid nodata 1 nodata 2

i promise i've tried under sun , googled myself death past several days trying figure out. if need more info please tell me, sorry i'm not sure else say....help?! :(


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