apt-get update priblem

i have modified my sources list file with:

deb http://http.us.debian.org/debian stable main contrib non-free

deb http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free

deb http://security.debian.org stable/updates main contrib non-free

deb-src http://http.us.debian.org/debian stable main contrib non-free

deb-src http://non-us.debian.org/debian-non-US stable/non-US main contrib non-free
but i get the response:

Fetched 6075kB in 10s (564kB/s)
Reading package lists... Done
W: GPG error: http://non-us.debian.org stable/non-US Release: The following sign atures couldn't be verified because the public key is not available: NO_PUBKEY F 1D53D8C4F368D5D
W: You may want to run apt-get update to correct these problems

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Re: apt-get update priblem

You can ignore the message or else add the public key. The keys are occasionally revoked, so once in a while you need to do:

apt-get install debian-archive-keyring

If the software doesn't allow you to install something due to the lack of a key, you can set apt-get so that it doesn't require a key; create or edit the file /etc/apt/apt.conf and add the line:

APT::Get::AllowUnauthenticated 1

Allowing unauthenticated repositories isn't recommended, but if you can't find the key then you don't have much of a choice; still, you need to fix that problem as soon as you can.

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