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How do I fix the GPG error “NO_PUBKEY”?

I try to do sudo apt-get update and I get the following error message:

W: GPG error: http://www.openprinting.org lsb3.2 Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7A4B44C2D2A2203E

There is no such repo in my sources.list

What should I do?

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Look in /etc/apt/sources.list.d/ to see if it's in there. –  Jorge Castro Nov 21 '12 at 21:10
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marked as duplicate by Jorge Castro, qbi, ajmitch, belacqua, fossfreedom Nov 21 '12 at 22:51

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1 Answer

on the right top, there's the button to shutdown, go there and press the fourth option, it's the gui for updates.

if that however doesn't work, you could try

sudo apt-get -f install

that command repairs your ubuntu, but I had a problem with that once, so make sure you have all important data backed up

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