ubuntu 16.04 apt-get install安装python3-pip: Unable to correct problems, you have held broken packages

环境：Ubuntu16.04

问题：执行sudo apt-get install python3-pip是出现以下错误：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python3-pip : Depends: python-pip-whl (= 8.1.1-2) but 8.1.1-2ubuntu0.4 is to be installed
               Recommends: python3-dev (>= 3.2) but it is not going to be installed
               Recommends: python3-wheel but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

 

解决办法：

1、备份/etc/apt/sources.list

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bk

 

2、用下面的源替换/etc/apt/sources.list中的所有源

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
# 源码
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse

 

3、执行更新

sudo apt-get update

 

4、重新安装python3-pip

sudo apt-get install python3-pip