Docker ubuntu image the public key is not available: NO_PUBKEY 871920D1991BC93C

General
1

Step to reproduce

  1. download macOS docker from https://download.docker.com/mac/static/stable/x86_64/docker-20.10.16.tgz
  2. extract file
  3. execute
~/Downloads/docker/docker run --rm -it ubuntu bash
  1. In the containter,
root@926b2fa67ba4:/# apt-get update

the error is following

Err:1 http://security.ubuntu.com/ubuntu noble-security InRelease    
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C
Err:2 http://archive.ubuntu.com/ubuntu noble InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 871920D1991BC93C

Some post ( 22.04 - Cannot run apt update on ubuntu 22 docker image on a CentOS host - Ask Ubuntu ) recommend that I should use Docker >= 20.10.9, but why I still got the error.