ubuntu18.04换源

你可以使用以下命令将 Ubuntu 18.04 的软件源更换为国内镜像源：

1.备份原有源列表

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2.编辑源列表文件

sudo gedit /etc/apt/sources.list

3.将原有源列表中的内容全部删除，替换为以下内容：

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

4.更新源列表

sudo apt-get update

5.升级软件包

sudo apt-get upgrade

希望对你有所帮助。