pip install psycopg2 == 2.6给出错误命令“ python setup.py egg_info”失败，错误代码为/ tmp / pip-build-f6rRmm / psycopg2 /

我的项目正在运行postgreSQL，将系统升级到ubuntu 16.04，然后再次克隆项目后，我无法安装特定的软件包。

我也曾尝试清除postgresql和psycopg2，但无法安装

(temp) hellrazor@hellrazor-desktop:~/workspace/te___ave/backend/te___ave$ pip install psycopg2==2.6 > ERROR.txt
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-f6rRmm/psycopg2/
(temp) hellrazor@hellrazor-desktop:~/workspace/te___ave/backend/te___ave$ 

这是我得到的错误

Collecting psycopg2==2.6
  Using cached psycopg2-2.6.tar.gz
    Complete output from command python setup.py egg_info:
    running egg_info
    creating pip-egg-info/psycopg2.egg-info
    writing pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
    writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing manifest file 'pip-egg-info/psycopg2.egg-info/SOURCES.txt'
    Error: pg_config executable not found.

    Please add the directory containing pg_config to the PATH
    or specify the full executable path with the option:

        python setup.py build_ext --pg-config /path/to/pg_config build ...

    or with the pg_config option in 'setup.cfg'.

    ----------------------------------------

我完成了https://help.ubuntu.com/community/PostgreSQL#Client_Installation中编写的所有步骤

另外在找不到pg_config可执行文件的一些答案中，我看到我需要添加sudo apt-get install libpq-dev python-dev

但是它给出了这个输出

(temp) hellrazor@hellrazor-desktop:~/workspace/teamwave/backend/teamwave$ sudo apt-get install libpq-dev python-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python-dev is already the newest version (2.7.11-1).
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:
 libpq-dev : Depends: libpq5 (= 9.5.10-0ubuntu0.16.04) but 10.1-1.pgdg16.04+1 is to be installed
E: Unable to correct problems, you have held broken packages.

我正在尝试找到解决错误的方法，但现在没有任何线索。