Revert 'Update Dockerfile"

Dockerfile

@@ -3,20 +3,9 @@ FROM nvidia/cuda:12.3.1-devel-ubuntu20.04
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update -y && \
-    apt install -y software-properties-common && \
-    add-apt-repository -y ppa:deadsnakes/ppa && \
-    apt-get update -y && \
     apt-get upgrade -y && \
 	apt-get install -y aria2 libgl1 libglib2.0-0 wget git git-lfs python3-pip python-is-python3 ffmpeg curl && \
-    apt-get remove -y python3 && \
-    alias pip='python3.11 -m pip' && \
-    alias python='python3.11' && \
-    apt-get install -y python3.11 python3-pip python3.11-distutils
-
-RUN update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.11 999 \
-    && update-alternatives --config python3 && ln -s /usr/bin/python3 /usr/bin/python
-RUN curl -sS https://bootstrap.pypa.io/get-pip.py | python3.11
-RUN pip install packaging
+    pip install packaging
 RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly -y
 ENV PATH="/root/.cargo/bin:${PATH}"