我用过了
deb http://old-releases.ubuntu.com/ubuntu/ quantal main restricted
之类的在我的sources.list. 我想尝试升级但不确定如何修复我的sources.list文件。这是我的备份，但它给了我 404 的负载并且没有升级选项。有什么办法修复吗？
– 如：sources.list从 12.10 升级使用什么文件？
# deb cdrom:[Ubuntu 12.10 _Quantal Quetzal_ - Release i386 (20121017.2)]/ quantal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://no.archive.ubuntu.com/ubuntu/ quantal main restricted
deb-src http://no.archive.ubuntu.com/ubuntu/ quantal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://no.archive.ubuntu.com/ubuntu/ quantal-updates main restricted
deb-src http://no.archive.ubuntu.com/ubuntu/ quantal-updates main …