Comment 3 for bug 355447

Same issue over here on 8.10 to 9.04 upgrade:

Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
1 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Setting up python-wxgtk2.8 (2.8.9.1-0ubuntu5) ...
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/__init__.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/__version__.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_controls.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_gdi.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_misc.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_windows.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/animate.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/aui.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/build/__init__.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/build/build_options.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/build/config.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/calendar.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/combo.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/gizmos.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/glcanvas.py
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/grid.py
##########################
# CLIPPED
##########################
file does not exist: /usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wxPython/xrc.py
pycentral: pycentral pkginstall: error byte-compiling files (434)
pycentral pkginstall: error byte-compiling files (434)
dpkg: error processing python-wxgtk2.8 (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 python-wxgtk2.8
E: Sub-process /usr/bin/dpkg returned an error code (1)

Installing python-wxaddon didnt solve the issue, infact gave birth to another broken one..