apt-get install Unable to locate package

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Unable to locate package ***
遇到这个问题直接尝试sudo apt-get update 和 sudo apt-get upgrade 一般可以解决，

但是执行之后出现源的问题，访问ubuntu 官方源link time out.

Cannot initiate the connection to cn.archive.ubuntu.com:80 (2001:67c:1562::18)

1、划重点：直接换源

注释掉Ubuntu 官方deb 链接，添加国内源链接

sudo vim /etc/apt/source.list

添加国内原链接：阿里源或者其他国内源

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

sudo apt-get update

sudo apt-get upgrade

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