jiridanek commented on a change in pull request #1536:
URL: https://github.com/apache/qpid-dispatch/pull/1536#discussion_r825969556



##########
File path: dockerfiles/Dockerfile-ubuntu
##########
@@ -16,14 +16,17 @@
 # specific language governing permissions and limitations
 # under the License.
 #
+
 # Copy this docker file to your local folder. Build the docker file like this 
- sudo docker build -t <username>/dispatch --file=Dockerfile-ubuntu . (don't 
miss the dot at the end)
 # To run it - sudo docker run -i -t <username>/dispatch (this will launch the 
dispatch router)
 
-# Gets the trusty Ubuntu from dockerhub
-FROM ubuntu:latest
+# Gets the Ubuntu from dockerhub
+FROM docker.io/library/ubuntu:focal

Review comment:
       I wanted to add `:focal` because of the `PYTHONPATH` hardcoded almost at 
the end. In newer ubuntu, there will be newer Python and things would break. 
So, focal.
   
   About `docker.io/library` I just wanted to be explicit. Podman and Docker 
have different search paths... (they both include the docker.io/library, though.
   
   > Explicit is better than implicit.
   https://peps.python.org/pep-0020/#the-zen-of-python
   
   I can of course undo this. IMO it is pretty much the same this way, or the 
way it was...




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