ubuntu怎么选择最快的更新源? ubuntu更改最快的更新源的图文教程

    给ubuntu选择最快的更新源
    1、打开设置》》软件和更新，如下图
    
    2、下载自：下拉菜单，选择其他站点
    
    3、你可以选择最佳服务器，也可以指定你满意的服务器。选择之后要求输入密码
    
    4、选择关闭，之后会重新自动执行更新命令（sudo apt-get update），更新完成
    
    安装Ubuntu18.04后，使用国外源太慢了，修改为国内源会快很多。
    修改阿里源为Ubuntu 18.04默认的源
    备份/etc/apt/sources.list
    #备份
    cp /etc/apt/sources.list /etc/apt/sources.list.bak
    在/etc/apt/sources.list文件前面添加如下条目
    #添加阿里源
    deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
    deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
    deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
    deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
    deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
    deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
    deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
    deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
    deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
    deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
    最后执行如下命令更新源
    ##更新
    sudo apt-get update
    sudo apt-get upgrade
    另外其他几个国内源如下：
    中科大源
    ##中科大源
    deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
    deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
    deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
    deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
    deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
    deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
    deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
    deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
    deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
    deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
    163源
    ##163源
    deb http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
    deb http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
    deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
    deb http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
    deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
    deb-src http://mirrors.163.com/ubuntu/ bionic main restricted universe multiverse
    deb-src http://mirrors.163.com/ubuntu/ bionic-security main restricted universe multiverse
    deb-src http://mirrors.163.com/ubuntu/ bionic-updates main restricted universe multiverse
    deb-src http://mirrors.163.com/ubuntu/ bionic-proposed main restricted universe multiverse
    deb-src http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
    清华源
    ##清华源
    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