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How to fix GPG error NO_PUBKEY in Ubuntu

How to fix GPG error NO_PUBKEY in Ubuntu
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I have a VPS for testing/developing, when I try Ubuntu 14.04 template for openvz, I got GPG error NO_PUBKEY when I run apt-get update or install whatever package. I guess because the Ubuntu 14.04 openvz template the provider use is missing public key for Ubuntu 14.04 trusty’s repository. I tried y-ppa-manager program to import all missing GPG keys but no luck.

W: GPG error: http://archive.canonical.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

W: GPG error: http://security.ubuntu.com trusty-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

W: GPG error: http://archive.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

W: GPG error: http://archive.ubuntu.com trusty-updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

I found a way to solve GPG error NO_PUBKEY error, all we need to do is to download the missing key using the hexadecimal numbers given in the error with apt-key (APT key management utility) command. In my case the hexadecimal number is 40976EAF437D05B5 and 3B4FE6ACC0B21F32. After running apt-key to download the missing PUBKEY, packages from that repositories will be considered trusted and you won’t NO_PUBKEY again.

So let’s do it (your missing PUBKEY may be different so use the hexadecimal number given from your error)

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5

and the output

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.RjvPYT2oIP --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 40976EAF437D05B5

gpg: requesting key 437D05B5 from hkp server keyserver.ubuntu.com

gpg: key 437D05B5: public key "Ubuntu Archive Automatic Signing Key " imported

gpg: Total number processed: 1

gpg:               imported: 1
$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
and the output
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.1LP43k8aGL --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32

gpg: requesting key C0B21F32 from hkp server keyserver.ubuntu.com

gpg: key C0B21F32: public key "Ubuntu Archive Automatic Signing Key (2012) " imported

gpg: Total number processed: 1

gpg:               imported: 1  (RSA: 1)
Now run apt-get update again or install any package, you should not see any error asking for missing PUBKEY.
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