问如何在Dockerfile烧瓶中安装python-apt？

EN

FROM ubuntu:xenial
RUN apt-get update --fix-missing
RUN apt-get install -y --fix-missing curl wget zip python-dev python-pip
RUN apt-get install -y build-essential openssh-client tcpdump
RUN pip install requests elasticsearch elasticsearch-dsl virtualenv
RUN cd /opt && virtualenv flask
RUN /opt/flask/bin/pip install flask simplejson requests

EXPOSE 8094

ADD . /opt/
RUN chmod 755 /opt/run.sh

ENTRYPOINT [ "/opt/run.sh" ]

RUN /opt/flask/bin/pip install python-apt

Step 9/13 : RUN /opt/flask/bin/pip install python-apt
 ---> Running in ed421699d0c0
Collecting python-apt
  Downloading python-apt-0.7.8.tar.bz2 (49kB)
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-Mx7WQq/python-apt/setup.py", line 6, in <module>
        from DistUtilsExtra.command import *
    ImportError: No module named DistUtilsExtra.command

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-Mx7WQq/python-apt/
The command '/bin/sh -c /opt/flask/bin/pip install python-apt' returned a non-zero code: 1