我正在尝试将 Ubuntu 10 升级到 12，并将 archive.ubuntu.com 修改为 old-releases.ubuntu.com。但仍然无法解析 security.ubuntu.com。旧版本安全链接的正确 URL 应该是什么？
以下是 sources.list：
#
# deb cdrom:[Ubuntu-Server 8.04.3 _Hardy Heron_ - Release amd64 (20090709)]/ hardy main restricted
# deb cdrom:[Ubuntu-Server 8.04.3 _Hardy Heron_ - Release amd64 (20090709)]/ hardy main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://old-releases.ubuntu.com/ubuntu lucid main restricted
deb-src http://old-releases.ubuntu.com/ubuntu lucid main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://old-releases.ubuntu.com/ubuntu lucid-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu lucid-updates main restricted
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://old-releases.ubuntu.com/ubuntu lucid universe
deb-src http://old-releases.ubuntu.com/ubuntu lucid universe
deb http://old-releases.ubuntu.com/ubuntu lucid-updates universe
deb-src http://old-releases.ubuntu.com/ubuntu 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 http://old-releases.ubuntu.com/ubuntu lucid multiverse
deb-src http://old-releases.ubuntu.com/ubuntu lucid multiverse
deb http://old-releases.ubuntu.com/ubuntu lucid-updates multiverse
deb-src http://old-releases.ubuntu.com/ubuntu lucid-updates 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 http://old-releases.ubuntu.com/ubuntu/ hardy-backports main restricted universe multiverse
# deb-src http://old-releases.ubuntu.com/ubuntu/ hardy-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 http://archive.canonical.com/ubuntu hardy partner
# deb-src http://archive.canonical.com/ubuntu hardy partner
deb http://old-releases.ubuntu.com/ubuntu lucid-security main restricted
deb-src http://old-releases.ubuntu.com/ubuntu lucid-security main restricted
deb http://old-releases.ubuntu.com/ubuntu lucid-security universe
deb-src http://old-releases.ubuntu.com/ubuntu lucid-security universe
deb http://old-releases.ubuntu.com/ubuntu lucid-security multiverse
deb-src http://old-releases.ubuntu.com/ubuntu lucid-security multiverse