ubuntu更新源列表，linux更新源
很多朋友对于ubuntu更新源列表和linux更新源不太懂，今天就由小编来为大家分享，希望可以帮助到大家，下面一起来看看吧！
ubuntu 如何更新软件源
在Ubuntu系统中更新软件源是一项重要的维护操作，可以帮助你获得最新的软件包。首先，打开终端窗口，进行备份操作，确保在更改源列表前保留原始设置。输入命令：sudo cp/etc/apt/sources.list/etc/apt/sources.list_backup，这一步骤将当前的源列表文件复制为备份。
接着，使用文本编辑器如gedit打开源列表文件，执行命令：sudo gedit/etc/apt/sources.list。在打开的文件中，将原有的内容全部删除，然后根据你的地区和网络环境，插入适合的源地址。例如，可以选择中国境内的镜像源，以提高下载速度和稳定性。
完成源列表的更新后，执行sudo apt-get update命令，更新源列表中的信息。在执行此命令时，可能会遇到连接失败的情况，这时需要检查并删除不可用的源，然后再次执行sudo apt-get update。
如果一切顺利，源列表更新完成后，就可以使用sudo apt-get upgrade命令来升级系统中所有可用的软件包了。通过这种方式，你可以确保系统的安全性，并及时获得最新的功能和改进。
ubuntu12.04怎么改变更新源
1、首先备份 Ubuntu12.04源列表
sudo cp/etc/apt/sources.list/etc/apt/sources.list.backup（备份下当前的源列表）
2、修改更新源
sudo gedit/etc/apt/sources.list（打开 Ubuntu 12.04源列表文件）
3、把里面的列表替换成下面的列表
163源
deb precise main restricted
deb-src precise main restricted
deb precise-updates main restricted
deb-src precise-updates main restricted
deb precise universe
deb-src precise universe
deb precise-updates universe
deb-src precise-updates universe
deb precise multiverse
deb-src precise multiverse
deb precise-updates multiverse
deb-src precise-updates multiverse
deb precise-backports main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb precise-security main restricted
deb-src precise-security main restricted
deb precise-security universe
deb-src precise-security universe
deb precise-security multiverse
deb-src precise-security multiverse
deb precise main
deb-src precise main
sohu源
deb precise main restricted
deb-src precise main restricted
deb precise-updates main restricted
deb-src precise-updates main restricted
deb precise universe
deb-src precise universe
deb precise-updates universe
deb-src precise-updates universe
deb precise multiverse
deb-src precise multiverse
deb precise-updates multiverse
deb-src precise-updates multiverse
deb precise-backports main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb precise-security main restricted
deb-src precise-security main restricted
deb precise-security universe
deb-src precise-security universe
deb precise-security multiverse
deb-src precise-security multiverse
deb precise main
deb-src precise main
ubuntu.cn99.com源（推荐）:
deb precise main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise main restricted universe multiverse
教育网源
如果你是在校大学生，可以使用校园网/教育网，就是用教育网的资源吧，尤其是支持 ipv6的，那更新速度就按兆算了。
#电子科技大学
deb precise main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise-proposed main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb-src precise main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb-src precise-proposed main restricted universe multiverse
deb-src precise-security main restricted universe multiverse
deb-src precise-updates main restricted universe multiverse
#中国科技大学
deb precise main restricted universe multiverse
deb precise-backports restricted universe multiverse
deb precise-proposed main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb-src precise main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb-src precise-proposed main restricted universe multiverse
deb-src precise-security main restricted universe multiverse
deb-src precise-updates main restricted universe multiverse
#北京理工大学
deb precise main multiverse restricted universe
deb precise-backports main multiverse restricted universe
deb precise-proposed main multiverse restricted universe
deb precise-security main multiverse restricted universe
deb precise-updates main multiverse restricted universe
deb-src precise main multiverse restricted universe
deb-src precise-backports main multiverse restricted universe
deb-src precise-proposed main multiverse restricted universe
deb-src precise-security main multiverse restricted universe
deb-src precise-updates main multiverse restricted universe
ubuntu 如何添加光盘源
方案一：使用DVD光盘首先把你的光盘放入光驱，待光驱读取一段时间自动挂载后，打开终端，
执行：$ sudo apt-cdrom-m-d/media/cdrom0 add
执行结果如下：现把/media/ubuntu-12.04-dvd/作为了 CD-ROM的挂载点
正在鉴别.. [6c9fa028a2a77a6a3b571ccefb68b9ea-2]
正在光盘中查找索引文件..找到了 2个软件包索引、0个源代码包索引、0个翻译索引和 1个数字签名
这张光盘现在的名字是：“Ubuntu-Server 12.04.1 LTS _Precise Pangolin_- Release i386(20120817.3)”
正在复制软件包列表……gpgv:于 2012年04月22日星期三 03时02分02秒 CST创建的签名，使用 DSA，钥匙号 FBB75451
gpgv:完好的签名，来自于“Ubuntu CD Image Automatic Signing Key<cdimage@ubuntu.com>”
Reading Package Indexes...完成
正在写入新的软件包源列表
对应于该光盘的软件包源设置项是：
deb cdrom:[Ubuntu-Server 12.04.1 LTS _Precise Pangolin_- Release i386(20120817.3)]/ jaunty main restricted
请对您的光盘套件中的其它光盘重复相同的操作。
W: Skipping non-exisiting file/media/ubuntu-12.04-dvd/dists/jaunty/main/binary-i386/Packages
W: Skipping non-exisiting file/media/ubuntu-12.04-dvd/dists/jaunty/main/debian-installer/binary-i386/Packages
W: Skipping non-exisiting file/media/ubuntu-12.04-dvd/dists/jaunty/restricted/binary-i386/Packages
然后执行：sudo apt-get update就可以安装你想要到软件了。
注意，执行完成后查看cat/etc/apt/sources.list文件，确保文件如下一行在文件顶部或者在网络源前面，否则，安装软件的时候系统还是优先从网络上下载。
deb cdrom:[Ubuntu-Server 12.04.1 LTS _Precise Pangolin_- Release i386(20120817.3)]/ precise main restricted
..................................................................................................................
方案二：使用iso镜像
首先，你必须先挂载你的iso镜像文件。
$ sudo mount-o loop-t iso9660/.../ubuntu-12.04-dvd-i386.iso/media/cdrom0/（红色部分为你的iso文件的绝对路径）
$ sudo apt-cdrom-m-d/media/cdrom0 add
这样就同方案一显示的一样。推荐使用方案二，一来操作方便，二来可以减少光驱的使用次数，延长其寿命
完成后安装vsftpd即可顺利完成。（因为光盘中有vsftpd软件）
$ sudo apt-get install vsftpd
