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1.问题：我们下载好的Ubantu，发现网速太慢了，下载一个软件包下载了几个小时都不一定得
2.什么原因造成的呢？
因为我们安装好ubuntu双系统\单系统后，默认的软件更新源是国外的， 我们可以打开源目录看看： 先切换到目录：cd /etc/apt 查看/编辑目录：sudo vi sources.list 我们可以发现：里面的源都是关于cn.archive.ubuntu.com 这个就是国外的软件更新源 3.怎么解决呢？国外的软件更新源在国内使用速度很慢，需要更换成国内的源，这样才能正常安装和更新软件。 怎么更换呢？打开终端命令行界面中，先将sources.list文件备份一个，更新源服务器地址就是存在这个文件里面的，所以主要就是对这个文件进行编辑就可以了，也是很简单的。 1.先切换到目录：cd /etc/apt 2.备份源（防止意外或后续需要）输入：sudo cp sources.list sources.list.old 3.编辑源:sudo vi sources.list 4.将文件中内容全部删除 5.更换源，有一下几种源可以选择，推荐阿里云（1）、阿里云 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（2）、清华大学 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse（3）、中科大 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse 6、复制其中一种粘贴完后，保存退出。然后别忘了更新缓存。输入：sudo apt-get update 更新缓存需要一点时间，更新完就可以了。 执行sudo apt-get update后续出现的问题，如没出现请忽略：如输入：sudo apt-get update后出现这些信息 W: Unknown Multi-Arch type 'no' for package 'compiz-core' W: Unknown Multi-Arch type 'no' for package 'compiz-gnome' W: Unknown Multi-Arch type 'no' for package 'libxapian-dev' W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min W: Unknown Multi-Arch type 'no' for package 'kwin' W: Unknown Multi-Arch type 'no' for package 'kwin-dev' W: Unknown Multi-Arch type 'no' for package 'kwin-wayland' W: Unknown Multi-Arch type 'no' for package 'kwin-x11' W: Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev' W: Ignoring Provides line with DepCompareOp for package php-psr-http-message-implementation W: Ignoring Provides line with DepCompareOp for package php-psr-log-implementation W: Ignoring Provides line with DepCompareOp for package php-seclib W: Ignoring Provides line with DepCompareOp for package php-sabre-http W: Ignoring Provides line with DepCompareOp for package php-math-biginteger W: Ignoring Provides line with DepCompareOp for package pypy-cffi W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min W: Unknown Multi-Arch type 'no' for package 'compiz-core' W: Unknown Multi-Arch type 'no' for package 'compiz-gnome' W: Unknown Multi-Arch type 'no' for package 'libxapian-dev' W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min W: Unknown Multi-Arch type 'no' for package 'kwin-dev' W: Unknown Multi-Arch type 'no' for package 'kwin-wayland' W: Unknown Multi-Arch type 'no' for package 'kwin-x11' W: Unknown Multi-Arch type 'no' for package 'libkf5sysguard-dev' W: Ignoring Provides line with DepCompareOp for package pypy-cffi W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min W: Unknown Multi-Arch type 'no' for package 'compiz-core' W: Unknown Multi-Arch type 'no' for package 'compiz-gnome' W: Ignoring Provides line with DepCompareOp for package xserver-xorg W: Ignoring Provides line with DepCompareOp for package php-math-biginteger W: Ignoring Provides line with DepCompareOp for package pypy-cffi W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min W: Unknown Multi-Arch type 'no' for package 'compiz-core' W: Unknown Multi-Arch type 'no' for package 'compiz-gnome' W: Ignoring Provides line with DepCompareOp for package xserver-xorg W: Ignoring Provides line with DepCompareOp for package pypy-cffi W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min W: 您可能需要运行 apt-get update 来解决这些问题怎么办呢？ 执行如下命令：sudo apt-get install -f apt 再次输入：sudo apt-get update OK,问题解决 |
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