python ImportError:没有名为'apt_pkg'的模块

Question

当我尝试 sudo add-apt-repository ppa:webupd8team/java

ubuntu终端显示此错误消息.

Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 11, in <module>
    from softwareproperties.SoftwareProperties import SoftwareProperties
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 27, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 21, in <module>
    import apt_pkg

虽然我尝试apt-get install python3-apt但仍然没有工作(我也尝试重新安装后删除),我也试过pip3 install apt-pkg但它说

Downloading/unpacking apt-pkg
  Could not find any downloads that satisfy the requirement apt-pkg
No distributions at all found for apt-pkg
Storing complete log in /home/kim/.pip/pip.log

当然,导入apt_pkg也不能在python3中工作(但它在python2.7中工作,我有两个版本的python一个是2.7另一个是3.3)

我怎么能在python3上安装这个包