Ubuntu 12.04 更新源

下文来自：http://www.ubuntusoft.com/ubuntu-update-source.html

手动修改方式：

163源

deb http://mirrors.163.com/ubuntu/ precise main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise main restricted
 deb http://mirrors.163.com/ubuntu/ precise-updates main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted
 deb http://mirrors.163.com/ubuntu/ precise universe
 deb-src http://mirrors.163.com/ubuntu/ precise universe
 deb http://mirrors.163.com/ubuntu/ precise-updates universe
 deb-src http://mirrors.163.com/ubuntu/ precise-updates universe
 deb http://mirrors.163.com/ubuntu/ precise multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise multiverse
 deb http://mirrors.163.com/ubuntu/ precise-updates multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-updates multiverse
 deb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
 deb http://mirrors.163.com/ubuntu/ precise-security main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise-security main restricted
 deb http://mirrors.163.com/ubuntu/ precise-security universe
 deb-src http://mirrors.163.com/ubuntu/ precise-security universe
 deb http://mirrors.163.com/ubuntu/ precise-security multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-security multiverse
 deb http://extras.ubuntu.com/ubuntu precise main
 deb-src http://extras.ubuntu.com/ubuntu precise main

sohu源

deb http://mirrors.sohu.com/ubuntu/ precise main restricted
 deb-src http://mirrors.sohu.com/ubuntu/ precise main restricted
 deb http://mirrors.sohu.com/ubuntu/ precise-updates main restricted
 deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted
 deb http://mirrors.sohu.com/ubuntu/ precise universe
 deb-src http://mirrors.sohu.com/ubuntu/ precise universe
 deb http://mirrors.sohu.com/ubuntu/ precise-updates universe
 deb-src http://mirrors.sohu.com/ubuntu/ precise-updates universe
 deb http://mirrors.sohu.com/ubuntu/ precise multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ precise multiverse
 deb http://mirrors.sohu.com/ubuntu/ precise-updates multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiverse
 deb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse
 deb http://mirrors.sohu.com/ubuntu/ precise-security main restricted
 deb-src http://mirrors.sohu.com/ubuntu/ precise-security main restricted
 deb http://mirrors.sohu.com/ubuntu/ precise-security universe
 deb-src http://mirrors.sohu.com/ubuntu/ precise-security universe
 deb http://mirrors.sohu.com/ubuntu/ precise-security multiverse
 deb-src http://mirrors.sohu.com/ubuntu/ precise-security multiverse
 deb http://extras.ubuntu.com/ubuntu precise main
 deb-src http://extras.ubuntu.com/ubuntu precise main

使用方式：

sudo gedit /etc/apt/sources.list

然后把里面的列表替换成上面的列表，保存退出即可，修改完之后最好刷新一下系统的源：

sudo apt-get update

系统修改方式：

事实上，Ubuntu 已经收录了国内大部分知名的源，所以无需上网查找。

打开软件中心 – 编辑 – 软件源 ，然后点击源的列表 – 其他站点：

然后可以自己选择一个源，建议163源，比较稳定

选中后，点击右下角的选择服务器即可！

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以上可能会出现下面的错误：

W:GPG error: http://extras.ubuntu.com maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192

W:Failed to fetch http://ppa.launchpad.net/mozillateam...64/Packages.gz 404 Not Found

解决办法：

I did the easy step with following result:

tom@tom-laptop:~$ apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv-keys 16126D3A3E5C1192
gpg: requesting key 3E5C1192 from hkp server keyserver.ubuntu.com
gpgkeys: HTTP fetch error 7: couldn't connect to host
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

然后再：apt-get update