Save it. Go to the Terminal and type:
sudo apt-get update
sudo apt-get upgrade
# Repository List based on standard Jaunty with many extra packages
#
# If you get errors about missing keys, lookup the key in this file
# and run these commands (replace KEY with the key number):
#
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com KEY
# Ubuntu supported packages
deb http://archive.ubuntu.com/ubuntu jaunty main restricted multiverse universe
deb http://archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jaunty-updates main restricted multiverse universe
deb http://security.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu jaunty main restricted multiverse universe
deb-src http://archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu jaunty-updates main restricted multiverse universe
deb-src http://security.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
#Canonical Commercial Repository
deb http://archive.canonical.com/ubuntu jaunty partner
deb http://archive.canonical.com/ubuntu jaunty-backports partner
deb http://archive.canonical.com/ubuntu jaunty-updates partner
deb http://archive.canonical.com/ubuntu jaunty-security partner
deb http://archive.canonical.com/ubuntu jaunty-proposed partner
deb-src http://archive.canonical.com/ubuntu jaunty partner
deb-src http://archive.canonical.com/ubuntu jaunty-backports partner
deb-src http://archive.canonical.com/ubuntu jaunty-updates partner
deb-src http://archive.canonical.com/ubuntu jaunty-security partner
deb-src http://archive.canonical.com/ubuntu jaunty-proposed partner
#gnome-globalmenu
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 7889D725DA6DEEAA
deb http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu jaunty main
#chromium-browser
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 5A9BF3BB4E5E17B5
deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu jaunty main
#opera
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 033431536A423791
deb http://deb.opera.com/opera/ lenny non-free
#skype
deb http://download.skype.com/linux/repos/debian stable non-free
#firefox
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 632D16BB0C713DA6
deb http://ppa.launchpad.net/fta/ppa/ubuntu jaunty main
#gnome-do
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 28A8205077558DD0
deb http://ppa.launchpad.net/do-core/ppa/ubuntu jaunty main
#compiz-fusion
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2ED6BB6042C24D89
deb http://ppa.launchpad.net/compiz/ubuntu jaunty main
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com A040830F7FAC5991
deb http://dl.google.com/linux/deb/ stable non-free
#shutter
deb http://ppa.launchpad.net/shutter/ppa/ubuntu jaunty main
#medibuntu
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2EBC26B60C5A2783
deb http://packages.medibuntu.org/ jaunty free non-free
deb-src http://packages.medibuntu.org/ jaunty free non-free
# MySQL Workbench
deb ftp://ftp.mysql.com/pub/mysql/download/gui-tools/ubuntu/ binary/
deb-src ftp://ftp.mysql.com/pub/mysql/download/gui-tools/ubuntu/ source/
# Virtualbox
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com DCF9F87B6DFBCBAE
deb http://download.virtualbox.org/virtualbox/debian jaunty non-free
# PlayOnLinux
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com FC6D7D9D009ED615
deb http://deb.playonlinux.com/ jaunty main
# Ubuntu tweak
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 6AF0E1940624A220
deb http://ppa.launchpad.net/tualatrix/ubuntu jaunty main
deb-src http://ppa.launchpad.net/tualatrix/ubuntu jaunty main
# disper tool multiple graphical displays
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 66D5C734F6EFB904
deb http://ppa.launchpad.net/wvengen/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/wvengen/ppa/ubuntu jaunty main
#nautilus-dropbox
deb http://linux.getdropbox.com/ubuntu jaunty main
#Drizzle
deb http://ppa.launchpad.net/drizzle-developers/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/drizzle-developers/ppa/ubuntu jaunty main
#subversion 1.6
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 6298AD34413576CB
deb http://ppa.launchpad.net/anders-kaseorg/subversion-1.6/ubuntu jaunty main
deb-src http://ppa.launchpad.net/anders-kaseorg/subversion-1.6/ubuntu jaunty main
#pidgin
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 7FB8BEE0A1F196A8
deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu jaunty main
#wine
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 58403026387EE263
deb http://wine.budgetdedicated.com/apt jaunty main
#gnome-colors theme
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 2D79F61BE8D31A30
deb http://ppa.launchpad.net/gnome-colors-packagers/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/gnome-colors-packagers/ppa/ubuntu jaunty main
#vlc 1
# sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com D739676F7613768D
deb http://ppa.launchpad.net/c-korn/vlc/ubuntu jaunty main
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source:http://linuxpoison.blogspot.com/2009/08/135781757116262.html