ubuntu12.04源更新方法：
1、首先备份Ubuntu 12.04源列表
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份下当前的源列表，有备无患嘛）
2、修改更新源
sudo gedit /etc/apt/sources.list （打开Ubuntu 12.04源列表文件）
3、将下面的代码粘贴进去（“#”开头的那一行为注释，可以直接复制进文件中）
4、通知ubuntu启用新的更新源 sudo apt-get update
#台湾源
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#网易 Ubuntu 11.10 源（速度很快）
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb precise-proposed universe main multiverse restricted
deb-src precise-proposed universe main multiverse restricted
deb precise-backports universe main multiverse restricted
deb-src precise-backports universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#骨头源，骨头源是bones7456架设的一个Ubuntu源 ，提供ubuntu,deepin
deb precise main universe restricted multiverse
deb-src precise main universe restricted multiverse
deb precise-security universe main multiverse restricted
deb-src precise-security universe main multiverse restricted
deb precise-updates universe main multiverse restricted
deb precise-proposed universe main multiverse restricted
deb-src precise-proposed universe main multiverse restricted
deb precise-backports universe main multiverse restricted
deb-src precise-backports universe main multiverse restricted
deb-src precise-updates universe main multiverse restricted
#mirror.lupaworld.com的源，速度很快
deb precise main restricted universe multiverse
deb precise-security main restricted universe multiverse
deb precise-updates main restricted universe multiverse
deb precise-backports main restricted universe multiverse
deb precise main restricted universe multiverse
#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
#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
#兰州大学
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe
#上海交通大学
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 precise 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
ubuntu12.04 汉字输入法：
安装输入法的第一步，是安装语言包。我们选择System Settings-->Language Support-->Install/Remove Languages
第二步，安装IBus框架，在终端输入以下命令：sudo apt-get install ibus ibus-clutter ibus-gtk ibus-gtk3 ibus-qt4
启动IBus框架，在终端输入：im-switch -s ibus安装完IBus框架后注销系统，保证更改立即生效
第三步：安装拼音引擎
有下面几种常用选择：
IBus拼音：sudo apt-get install ibus-pinyin
IBUS五笔：sudo apt-get install ibus-table-wubi
谷歌拼音输入法：sudo apt-get install ibus-googlepinyin
Sun拼音输入法：sudo apt-get install ibus-sunpinyin
第四步：设置IBus框架
ibus-setup
第五步：通常情况下，IBus图标（一个小键盘）会出现在桌面右上角的任务栏中。有时候这个图标会自行消失，可使用以下命令，找回消失的IBus图标：
ibus-daemon -drx
ubuntu12.04 gedit中文乱码问题：
打开终端输入：
sudo gsettings set org.gnome.gedit.preferences.encodings auto-detected "['GB18030', 'GB2312', 'GBK', 'UTF-8', 'BIG5', 'CURRENT', 'UTF-16']"
sudo gsettings set org.gnome.gedit.preferences.encodings shown-in-menu "['GB18030', 'GB2312', 'GBK', 'UTF-8', 'BIG5', 'CURRENT', 'UTF-16']"
解决乱码问题.
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