Update Dockerfile-cpu to `ubuntu:latest` (#17670)

Signed-off-by: UltralyticsAssistant <web@ultralytics.com>
Co-authored-by: Francesco Mattioli <Francesco.mttl@gmail.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

docker/Dockerfile

@@ -56,7 +56,6 @@ RUN pip install numpy==1.23.5
 # Remove extra build files
 RUN rm -rf tmp /root/.config/Ultralytics/persistent_cache.json
 
-
 # Usage Examples -------------------------------------------------------------------------------------------------------
 
 # Build and Push

docker/Dockerfile-cpu

@@ -2,8 +2,8 @@
 # Builds ultralytics/ultralytics:latest-cpu image on DockerHub https://hub.docker.com/r/ultralytics/ultralytics
 # Image is CPU-optimized for ONNX, OpenVINO and PyTorch YOLO11 deployments
 
-# Start FROM Ubuntu image https://hub.docker.com/_/ubuntu
-FROM ubuntu:23.10
+# Use official Python base image for reproducibility (3.11.10 for export and 3.12.6 for inference)
+FROM python:3.11.10-slim-bookworm
 
 # Set environment variables
 ENV PYTHONUNBUFFERED=1 \
@@ -39,14 +39,14 @@ RUN pip install -e ".[export]" --extra-index-url https://download.pytorch.org/wh
 RUN yolo export model=tmp/yolo11n.pt format=edgetpu imgsz=32
 RUN yolo export model=tmp/yolo11n.pt format=ncnn imgsz=32
 # Requires Python<=3.10, bug with paddlepaddle==2.5.0 https://github.com/PaddlePaddle/X2Paddle/issues/991
-# RUN pip install "paddlepaddle>=2.6.0" x2paddle
-
-# Creates a symbolic link to make 'python' point to 'python3'
-RUN ln -sf /usr/bin/python3 /usr/bin/python
+RUN pip install "paddlepaddle>=2.6.0" x2paddle
 
 # Remove extra build files
 RUN rm -rf tmp /root/.config/Ultralytics/persistent_cache.json
 
+# Set default command to bash
+CMD ["/bin/bash"]
+
 # Usage Examples -------------------------------------------------------------------------------------------------------
 
 # Build and Push

docker/Dockerfile-runner

@@ -35,7 +35,6 @@ ENTRYPOINT sh -c './config.sh --url https://github.com/ultralytics/ultralytics \
                               --replace && \
                   ./run.sh'
 
-
 # Usage Examples -------------------------------------------------------------------------------------------------------
 
 # Build and Push