以下是我用到的几个第三方的源和相应的密钥，因为Ubuntu自带的软件包，并不总是最新的，记下来备忘：
Ubuntu-Studio
deb http://archive.ubuntustudio.org/ubuntustudio feisty main  http://archive.ubuntustudio.org/ubuntustudio.gpg

VirtualBox
deb http://www.virtualbox.org/debian feisty non-free
http://www.virtualbox.org/debian/innotek.asc

Automatix2
deb http://www.getautomatix.com/apt feisty main
wget http://www.getautomatix.com/keys/automatix2.key
gpg --import automatix2.key
gpg --export --armor E23C5FC3 | sudo apt-key add -
mozilla
deb http://gnomefreak.youmortals.com/mozilla-testing feisty main

wine
deb-src http://wine.budgetdedicated.com/apt feisty main
http://wine.budgetdedicated.com/apt/387EE263.gpg -O- | sudo apt-key add -

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