error: W: GPG error: http://ppa.launchpad.net

Post date: May 10, 2012 3:33:13 PM

error: W: GPG error: http://ppa.launchpad.net maverick Release: The

following signatures couldn't be verified because the public key is

not available: NO_PUBKEY

Ever get an error during an Apt update like this? error: W: GPG error:

http://ppa.launchpad.net maverick Release: The following signatures

couldn't be verified because the public key is not available:

NO_PUBKEY 6E871C4A881574DE

Essentially you are getting this error because you are missing a key

from the repository / Key Server.

If you are using Ubuntu, this is a fairly easy fix.

The big thing to check is to make sure that you have TCP port number

11371 open. If you are using a Linux or BSD based firewall make sure

you make a NAT/Packet Filter rule to allow computers from inside to

access the keyserver on that port.

You will need to know the key server name, which is easy....

keyserver.ubuntu.com and the IP of that server which is: 91.189.89.49

Once you have the firewall all set up, then open terminal on your

linux box and either copy / paste or carefully type in the following:

wget -q "http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x6E871C4A881574DE"

-O- | sudo apt-key add -

The error message you received doesn't have to be the one I have

generated for this post... just change your error to fit the above

template... change the part "6E871C4A881574DE" to be whatever your

error code was...

You should get a reply from Terminal saying "OK". Once that happens,

run Apt-Get Update again, and verify that everything is good to go.