apt-get update Error

Question

I am running into this message whenever I try to do sudo apt-get update...

Get:1 http://security.ubuntu.com precise-security Release.gpg
Get:2 http://archive.canonical.com precise Release.gpg
Get:3 http://security.ubuntu.com hardy-security Release.gpg
Get:4 http://archive.canonical.com precise Release                             
Get:5 http://us.archive.ubuntu.com precise Release.gpg         
Get:6 http://us.archive.ubuntu.com precise-updates Release.gpg
Get:7 http://us.archive.ubuntu.com precise-backports Release.gpg
Get:8 http://security.ubuntu.com precise-security Release
Get:9 http://us.archive.ubuntu.com precise Release                             
Get:10 http://security.ubuntu.com hardy-security Release                       
Get:11 http://us.archive.ubuntu.com precise-updates Release                    
Get:12 http://us.archive.ubuntu.com precise-backports Release    
Ign http://archive.canonical.com precise Release                 
E: GPG error: http://archive.canonical.com precise Release: The following signatures were invalid: NODATA 1 NODATA 2

I am running Ubuntu 12.04 behind my university proxy. can anyone help?

If that doesn't help perhaps it's an issue of the GPG error? There's a long thread about it here: GPG key error when attemting to download updates. Note that I'm not providing this as an answer because I have no experience of proxy servers or GPG errors. — , Mar 24 '13 at 02:51
If that question (which this is currently closed as a duplicate of) doesn't help, see Update Manager Error - Authentication Error, which is about this specific error (with "NODATA"). — Eliah Kagan, Apr 13 '13 at 06:19

apt-get update Error

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