編輯Ubuntu源的方法：

#sudo gedit /etc/apt/sources.list

將文件里的內容全部刪除，當然之前也可以用sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak命令的方式進行備份，以備不時之需。然后將下列的內容粘貼進gedit后保存即可。

阿里云源

deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

（注：只復制粘貼所有deb開頭的行。細心的讀者會發現源sources.list文件中有以許多#開頭的行，這個#意味這此行為注釋行，不起作用，剩余的 deb的行才是真正的源）
電子科技大學源（校園網推薦，快）

deb? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid main restricted universe multiverse
deb? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-backports main restricted universe multiverse
deb? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-updates main restricted universe multiverse
deb-src? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid main restricted universe multiverse
deb-src? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-backports main restricted universe multiverse
deb-src? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb-src? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb-src? http://ubuntu.uestc.edu.cn/ubuntu/ ?lucid-updates main restricted universe multiverse

上海交大源（校園網推薦，快）


deb? http://ftp.sjtu.edu.cn/Ubuntu/ ?lucid main restricted universe multiverse
deb? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-backports main restricted universe multiverse
deb? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-updates main restricted universe multiverse
deb-src? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid main restricted universe multiverse
deb-src? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-backports main restricted universe multiverse
deb-src? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb-src? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb-src? http://ftp.sjtu.edu.cn/ubuntu/ ?lucid-updates main restricted universe multiverse


臺灣（使用這個很快）



deb? http://tw.archive.ubuntu.com/ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://tw.archive.ubuntu.com/ubuntu/ ?lucid main universe restricted multiverse
deb? http://tw.archive.ubuntu.com/ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://tw.archive.ubuntu.com/ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://tw.archive.ubuntu.com/ubuntu/ ?lucid-updates universe main multiverse restricted
deb-src? http://tw.archive.ubuntu.com/ubuntu/ ?lucid-updates universe main multiverse restricted


SRT Sources

deb? http://ubuntu.srt.cn/ubuntu/ ?lucid main restricted universe multiverse
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-updates main restricted universe multiverse
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-backports main restricted universe multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid main restricted universe multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-security main restricted universe multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-updates main restricted universe multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-proposed main restricted universe multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-backports main restricted universe multiverse

網易（很多人說這個很快，可是我這里用不了）


deb? http://mirrors.163.com/ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://mirrors.163.com/ubuntu/ ?lucid main universe restricted multiverse
deb? http://mirrors.163.com/ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://mirrors.163.com/ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://mirrors.163.com/ubuntu/ ?lucid-updates universe main multiverse restricted
deb? http://mirrors.163.com/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb-src? http://mirrors.163.com/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb? http://mirrors.163.com/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirrors.163.com/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirrors.163.com/ubuntu/ ?lucid-updates universe main multiverse restricted

ubuntu官方上海源


deb? http://mirror.rootguide.org/ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://mirror.rootguide.org/ubuntu/ ?lucid main universe restricted multiverse
deb? http://mirror.rootguide.org/ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://mirror.rootguide.org/ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://mirror.rootguide.org/ubuntu/ ?lucid-updates universe main multiverse restricted
deb? http://mirror.rootguide.org/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb-src? http://mirror.rootguide.org/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb? http://mirror.rootguide.org/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirror.rootguide.org/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirror.rootguide.org/ubuntu/ ?lucid-updates universe main multiverse restricted

搜狐


deb? http://mirrors.shlug.org/ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://mirrors.shlug.org/ubuntu/ ?lucid main universe restricted multiverse
deb? http://mirrors.shlug.org/ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://mirrors.shlug.org/ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://mirrors.shlug.org/ubuntu/ ?lucid-updates universe main multiverse restricted
deb? http://mirrors.shlug.org/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb-src? http://mirrors.shlug.org/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb? http://mirrors.shlug.org/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirrors.shlug.org/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirrors.shlug.org/ubuntu/ ?lucid-updates universe main multiverse restricted

骨頭源


deb? http://ubuntu.srt.cn/ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid main universe restricted multiverse
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-updates universe main multiverse restricted
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-proposed universe main multiverse restricted
deb? http://ubuntu.srt.cn/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://ubuntu.srt.cn/ubuntu/ ?lucid-updates universe main multiverse restricted

中國官方源


deb? http://mirror.lupaworld.com/Ubuntu/ ?lucid main universe restricted multiverse
deb-src? http://mirror.lupaworld.com/Ubuntu/ ?lucid main universe restricted multiverse
deb? http://mirror.lupaworld.com/Ubuntu/ ?lucid-security universe main multiverse restricted
deb-src? http://mirror.lupaworld.com/Ubuntu/ ?lucid-security universe main multiverse restricted
deb? http://mirror.lupaworld.com/Ubuntu/ ?lucid-updates universe main multiverse restricted
deb? http://mirror.lupaworld.com/Ubuntu/ ?lucid-proposed universe main multiverse restricted
deb-src? http://mirror.lupaworld.com/Ubuntu/ ?lucid-proposed universe main multiverse restricted
deb? http://mirror.lupaworld.com/Ubuntu/ ?lucid-backports universe main multiverse restricted
deb-src? http://mirror.lupaworld.com/Ubuntu/ ?lucid-backports universe main multiverse restricted

deb-src?http://mirror.lupaworld.com/Ubuntu/?lucid-updates universe main multiverse restricted

保存后輸入下面的指令刷新源信息：

#sudo apt-get update

然后輸入：

#sudo apt-get upgrade（這一步可能會相當慢）

就可以進行系統升級了。

總結

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