Ubuntu20.04更换国内源

备份源文件

1. sudo cp -v /etc/apt/sources.list /etc/apt/sources.list.backup

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执行chmod命令更改文件权限

1. sudo chmod 777 /etc/apt/sources.list

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通过gedit命令编辑软件源

1. sudo gedit /etc/apt/sources.list

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执行上面命令后如果报sudo: gedit: command not found的错误，执行下面命令

1. sudo apt install vim vim /etc/apt/sources.list

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阿里云国内源

1. deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
2. deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
3. deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
4. deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

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换完源之后执行以下命令

1. sudo apt update
2. sudo apt upgrade

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