其他Ubuntu版本只要把发行代号“lucid”改下就OK了，例如改为：natty，maverick，etc.
VirtualBox的源使用这个方法添加公钥：wget -q Oracle_vbox.asc -O- | sudo apt-key add -
#
# See for how to upgrade to
# newer versions of the distribution.
deb lucid main restrictd
deb-src lucid main restrictd
## Major bug fix updates produced after the final release of the
## distribution.
deb lucid-updates main restricted
deb-src lucid-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb lucid universe
deb-src lucid universe
deb lucid-updates universe
deb-src lucid-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb lucid multiverse
deb-src lucid multiverse
deb lucid-updates multiverse
deb-src lucid-updates multiverse
## Uncomment the following lines to add software from the 'proposed'
## respository.
# deb lucid-proposed main restricted universe multiverse
# deb-src lucid-proposed main restricted universe multiverse
## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb lucid-backports main restricted universe multiverse
# deb-src lucid-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb lucid partner
deb-src lucid partner
## Uncomment the following two lines to add software from the 'security'
## repository.
deb lucid-security main restricted
deb-src lucid-security main restricted
deb lucid-security universe
deb-src lucid-security universe
deb lucid-security multiverse
deb-src lucid-security multiverse
## Virtualbox
deb lucid contrib non-free
## Valac PPA (vala-team)
deb lucid main
## ibus-1.3 PPA （ibus-dev）
deb lucid main
#
# Sources from main servers.
deb lucid main restricted
deb-src lucid main restricted
deb lucid-updates main restricted
deb-src lucid-updates main restricted
deb lucid universe
deb-src lucid universe
deb lucid-updates universe
deb-src lucid-updates universe
deb lucid multiverse
deb-src lucid multiverse
deb lucid-updates multiverse
deb-src lucid-updates multiverse
# deb lucid-proposed main restricted universe multiverse
# deb-src lucid-proposed main restricted universe multiverse
# deb lucid-backports main restricted universe multiverse
# deb-src lucid-backports main restricted universe multiverse
deb lucid-security main restricted
deb-src lucid-security main restricted
deb lucid-security universe
deb-src lucid-security universe
deb lucid-security multiverse
deb-src lucid-security multiverse