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Apt-get Update GPG Key Errors and Fix

Running sudo apt-get upgrade, I started getting this error:

Reading package lists... Done

W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 313D312748A22A95

W: You may want to run apt-get update to correct these problems

Ah ha! But apt-get update is the command causing this problem.

The solution is to import this key from the gpg servers; I don’t know why this isn’t done automatically, but here is it:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 313D312748A22A95; gpg --export --armor 313D312748A22A95 | sudo apt-key add -

Resulting in:

Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --recv-keys --keyserver keyserver.ubuntu.com 313D312748A22A95
gpg: requesting key 48A22A95 from hkp server keyserver.ubuntu.com
gpg: key 48A22A95: public key "Launchpad PPA for Filip Brcic" imported
gpg: Total number processed: 1
gpg: unchanged: 1
OK

Congrats! sudo apt-get update now works properly!