未安装python3-venv ubuntu 14.04

全新安装ubuntu gnome 14.04，然后进行dist-upgrade

我尝试做的第一件事就是为python创建虚拟环境

python3 -m venv flask

给我

The virtual environment was not created successfully because ensurepip is not
available.  On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.

    apt-get install python3-venv

You may need to use sudo with that command.  After installing the python3-venv
package, recreate your virtual environment.

这很奇怪，因为我认为venv是默认安装的，但是无论如何

sudo apt-get install python3-venv

给我

E: Unable to locate package python3-venv

我错过了什么吗？我的python安装有问题吗？我试图用Google搜索是否有回购协议或我需要的东西，但找不到。

做：

sudo apt-get install python3.4-venv

然后您可以轻松地做到：

python3 -m venv flask

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