Sharing Linux: Fix GPG Error on Ubuntu 12.04 Precise Pangolin's Update

Sharing Linux: Fix GPG Error on Ubuntu 12.04 Precise Pangolin 'while sudo apt-get update'

case:
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220

open terminal (ctrl+alt+t)

[solution 1]
sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update


[solution 2]
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys YOURKEYNUMBERHERE

note: YOURKEYNUMBERHERE mean you key, for adekroisa's case is 6AF0E1940624A220 (look at case).. become like this:

  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6AF0E1940624A220

then.. update you ubuntu 12.04 precise pangolin
  sudo apt-get update


reference:
http://askubuntu.com/questions/85641/how-do-i-deal-with-unauthenticated-sources-errors-in-the-software-center
http://askubuntu.com/questions/102153/untrusted-package-errors-after-installing-security-tools
http://askubuntu.com/questions/36507/gpg-public-key-error-message

Finish, wokee..

Alhamdulillah.. how it will be useful :)


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