I have an ubuntu:latest image pulled locally from a couple of years ago, and it’s obviously not the latest since it’s over 2 years old. ‘docker images’ shows:
ubuntu latest d5ca7a445605 2 years ago 65.6MB
If I run the image with -it and cat the /etc/lsb-release file, it shows it’s 20.04. Docker Hub is currently showing latest as 22.04.
To update it, if I ‘docker pull ubuntu:latest’ then it shows:
> docker pull ubuntu:latest
latest: Pulling from library/ubuntu
70104cd59e2a: Pull complete
Digest: sha256:1b8d8ff4777f36f19bfe73ee4df61e3a0b789caeff29caa019539ec7c9a57f95
Status: Downloaded newer image for ubuntu:latest
docker.io/library/ubuntu:latest
If I now start it and cat /etc/lsb-release, it shows 22.04. Done!