ubuntu16.04没有2.8的源 ，它默认的是3.0
解决办法：
This was able to resolve this problem by doing this
sudo add-apt-repository ppa:nilarimogard/webupd8
Update the package index:
sudo apt-get update
Install python-wxgtk2.8 deb package:
sudo apt-get install python-wxgtk2.8