ubuntu sourcelist aliyun 20.04

要将Ubuntu 20.04的源列表更改为阿里云镜像，请按照以下步骤进行操作：

1.备份默认的源列表：

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

2.编辑源列表文件：

sudo nano /etc/apt/sources.list

3.将以下内容复制并粘贴到文件中：

#阿里云镜像源
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

#Canonical合作伙伴和商业软件源
deb http://archive.canonical.com/ubuntu/ focal partner
deb-src http://archive.canonical.com/ubuntu/ focal partner

4.保存并退出文件，然后更新软件包列表：

sudo apt update

现在，您的Ubuntu 20.04源列表已更改为阿里云镜像源。