依次执行如下命令(使用清华源可以走ipv6)
1.首先需要使用root用户sudo-s输入root密码2.进行原来源的备份cp /etc/apt/sources.list /etc/apt/sources.list.bak #备份3.进行源列表的修改vi /etc/apt/sources.list #修改deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiversedeb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiversedeb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiversedeb 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 multiverse4.查看是否已经修改cat /etc/apt/sources.list5.执行更新列表apt-get update #更新列表

本文详细介绍如何将Ubuntu系统的软件源更换为清华大学的镜像源,包括使用root用户进行操作、备份原有源列表、修改源列表文件并更新软件包列表等步骤。
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