Ubuntu20.04更换国内源
备份源文件sudo cp -v /etc/apt/sources.list /etc/apt/sources.list.backup执行chmod命令更改文件权限
sudo chmod 777 /etc/apt/sources.list通过gedit命令编辑软件源
sudo gedit /etc/apt/sources.list执行上面命令后如果报sudo: gedit: command not found的错误，执行下面命令
sudo apt install vim vim /etc/apt/sources.list阿里云国内源
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse换完源之后执行以下命令
sudo apt update
sudo apt upgrade
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