Error ketika update ubuntu 12.04 saya dengan pesan error: 

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/Release"</p>

saya coba solusi dari askubuntu dan sukses untuk ubuntu 12.04 saya…

sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update</p>

 

http://robert.penz.name/376/howto-fix-w-gpg-error-httpppa-launchpad-net-oneiric-release-the-following-signatures-were-invalid-badsig-c2518248eea14886-launchpad/

http://askubuntu.com/questions/104213/gpg-invalid-signature

 

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