Use aptitude instead of apt-get. It is more intelligent. It not only will handle downgrading conflicting packages for you, but will make a series of recommendations asking you which of many possible suggested working scenarios you would like.

sudo aptitude install myNewPackage

If you don't have aptitude on your machine yet, get it with

sudo apt-get install aptitude
 自动提出解决方案
 
参考：https://askubuntu.com/questions/363200/e-unable-to-correct-problems-you-have-held-broken-packages
 
 
 
安装pip时候  no model named setuptools
 
sudo apttitude install  -y python-setuptools

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