如何恢复sources.list 文件？

Question

我不小心删除了我的/etc/apt/sources.list文件。它是否由 Canonical 托管在某个地方，以便我可以将其重新添加到系统中？这有点紧急，所以我希望有人能提供一个快速的答案。

Answer 1

您可以启动到 Live CD（虚拟机就足够了）并/etc/apt/sources.list从中复制。或者，准备好 Live CD 映像并按照以下说明操作：

1. 挂载 CD。如果您有一个.iso文件，请使用以下命令挂载它：

   sudo mount -o loop ubuntu-11.04-desktop-amd64.iso /media/cdrom
   

2. 从 CD 挂载文件系统文件：

   sudo mount -o loop /media/cdrom/casper/filesystem.squashfs /mnt
   

3. 复制 sources.list 文件：

   sudo cp {/mnt,}/etc/apt/sources.list
   

4. 如有必要，更改文件权限：

   sudo chmod 644 /etc/apt/sources.list
   

从我的 Ubuntu 11.04 Live CD：

deb http://archive.ubuntu.com/ubuntu natty main restricted
deb-src http://archive.ubuntu.com/ubuntu natty main restricted

deb http://security.ubuntu.com/ubuntu natty-security main restricted
deb-src http://security.ubuntu.com/ubuntu natty-security main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu natty-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu natty-updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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 http://archive.ubuntu.com/ubuntu natty universe
# deb-src http://archive.ubuntu.com/ubuntu natty universe
# deb http://archive.ubuntu.com/ubuntu natty-updates universe
# deb-src http://archive.ubuntu.com/ubuntu natty-updates universe
# deb http://security.ubuntu.com/ubuntu natty-security universe
# deb-src http://security.ubuntu.com/ubuntu natty-security 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://archive.ubuntu.com/ubuntu natty multiverse
# deb-src http://archive.ubuntu.com/ubuntu natty multiverse
# deb http://archive.ubuntu.com/ubuntu natty-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu natty-updates multiverse
# deb http://security.ubuntu.com/ubuntu natty-security multiverse
# deb-src http://security.ubuntu.com/ubuntu natty-security multiverse

为获得最佳下载速度，您需要重新选择您附近的镜像：

1. 打开 Ubuntu 软件中心
2. 打开编辑->软件源...
3. 单击“下载自”旁边的选择框：
4. 选择您选择的服务器

您可能还想启用一些存储库，例如社区维护的开源软件 (universe)和受版权和法律问题限制的软件 (multiverse)