I trying many things with no success, so I want this:
In Ubuntu 14 I need both wxPython versions installed and running against
Python 2.7
wxPython 2.8 comes in repos so no issues with it, but how can I install
the wx3.0? is it stable or is better 2.9?
Different major versions (such as 2.8 and 3.0) of wxWidgets and wxPython should be able to coexist peacefully with each other as they will use versioned file or folder names for almost everything. However if one is installed from a repo package and one is built and installed manually then there may be some minor conflicts or issues you need to watch out for.
Another alternative would be to use virtualenv to set up a virtual Python installation, and then use that Python to build and install wxPython 3.0. The 3.0 stuff will then not be installed in the same locations as the 2.8 files, and your stock python will only see wxPython 2.8. When you need to work with wxPython 3.0 you use the python executable from the virtualenv instead. This will work better with Phoenix, but Classic should do okay too.