Dockerfile ubuntu version content error

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content:
FROM ubuntu:20.04 --> FROM ubuntu:21.04

location
3. 镜像的创建管理和发布
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一个Dockerfile的基本结构
Dockerfile

一个Dockerfile的基本结构
Dockerfile
FROM ubuntu:20.04
RUN apt-get update &&
DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y python3.9 python3-pip python3.9-dev
ADD hello.py /
CMD ["python3", "/hello.py"]