关于使用Ubuntu中sudo apt-get ubuntu 报错解决

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最近在使用Ubuntu进行图像处理编程，需要安装一些常用软件，需要使用sudo apt-get update 命令进行软件源更新，出现了报错情况，查看报错信息发现是无法访问到 cn.archive.ubuntu.com/*，报错信息如下：

Err http://cn.archive.ubuntu.com trusty InReleaseErr http://cn.archive.ubuntu.com trusty-updates InReleaseErr http://cn.archive.ubuntu.com trusty-backports InReleaseErr http://cn.archive.ubuntu.com trusty Release.gpg     W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/trusty/InRelease

这种情况一般我们使用国内的相关镜像就可以了。可以在system setting中的update&software中设置，也可以直接使用root权限更改/etc/apt/source.list文件。
注释掉原有的内容，填入一下内容（在这里使用的阿里云，下载速度挺快的）：

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

也可以使用163的源：

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

网上有人说需要改变DNS，但是我在没有改变的情况下，只是单纯的修改source.list文件也可以正常执行update命令。

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