原文地址：https://www.woozee.com.cn/article/25.html
打开/etc/apt/sources.list
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vi
/etc/apt/sources
.list
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将原有的数据注释掉，换上国内镜像
阿里云源
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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
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清华源
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deb 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 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 https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic-proposed main restricted universe multiverse
deb-src https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic main restricted universe multiverse
deb-src https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic-updates main restricted universe multiverse
deb-src https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic-backports main restricted universe multiverse
deb-src https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic-security main restricted universe multiverse
deb-src https:
//mirrors
.tuna.tsinghua.edu.cn
/ubuntu/
bionic-proposed main restricted universe multiverse
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中科大源
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deb 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 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 https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic-proposed main restricted universe multiverse
deb-src https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic main restricted universe multiverse
deb-src https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic-updates main restricted universe multiverse
deb-src https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic-backports main restricted universe multiverse
deb-src https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic-security main restricted universe multiverse
deb-src https:
//mirrors
.ustc.edu.cn
/ubuntu/
bionic-proposed main restricted universe multiverse
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更改完成之后执行以下命令
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apt update
apt upgrade
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