sudo apt update sudo apt upgrade -y
安装基础依赖 sudo apt install -y ca-certificates curl gnupg lsb-release
第 3 步：添加 Docker 官方 GPG Key sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg
| sudo gpg –dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg
第 4 步：添加 Docker 官方软件源（关键） echo
“deb [arch=$(dpkg –print-architecture) signed-by=/etc/apt/keyrings/docker.gpg]
https://download.docker.com/linux/ubuntu
$(. /etc/os-release && echo “$VERSION_CODENAME”) stable”
| sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
第 5 步：安装 Docker + Compose（一次完成） sudo apt update
sudo apt install -y
docker-ce
docker-ce-cli
containerd.io
docker-buildx-plugin
docker-compose-plugin
注意： 这里装的 docker-compose-plugin = Docker Compose v2 不要装老的 docker-compose
第 6 步：启动并设置 Docker 开机自启 sudo systemctl start docker sudo systemctl enable docker
docker compose version