Comment 7 for bug 634324

I had the same error with a freshly installed 10.10 today, and eventually I have made it work somehow.

Starting software-center (3.0.7) from terminal gave:

pbekesi@csacsi-desktop:~$ software-center
Traceback (most recent call last):
  File "/usr/bin/software-center", line 88, in <module>
    from softwarecenter.app import SoftwareCenterApp
  File "/usr/share/software-center/softwarecenter/app.py", line 62, in <module>
    from view.logindialog import LoginDialog
  File "/usr/share/software-center/softwarecenter/view/logindialog.py", line 30, in <module>
    from softwarecenter.backend.launchpad import GLaunchpad
  File "/usr/share/software-center/softwarecenter/backend/launchpad.py", line 32, in <module>
    from launchpadlib.launchpad import Launchpad
ImportError: No module named launchpadlib.launchpad

I reinstalled python-launchpadlib (1.6.1-1) to see if it fixes, but after I did this, starting software-center resulted in:

pbekesi@csacsi-desktop:~$ software-center
Traceback (most recent call last):
  File "/usr/bin/software-center", line 88, in <module>
    from softwarecenter.app import SoftwareCenterApp
  File "/usr/share/software-center/softwarecenter/app.py", line 62, in <module>
    from view.logindialog import LoginDialog
  File "/usr/share/software-center/softwarecenter/view/logindialog.py", line 30, in <module>
    from softwarecenter.backend.launchpad import GLaunchpad
  File "/usr/share/software-center/softwarecenter/backend/launchpad.py", line 32, in <module>
    from launchpadlib.launchpad import Launchpad
  File "/usr/lib/pymodules/python2.6/launchpadlib/launchpad.py", line 29, in <module>
    from lazr.restfulclient.resource import (
  File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/resource.py", line 41, in <module>
    from _browser import Browser, RestfulHttp
  File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/_browser.py", line 50, in <module>
    from _json import DatetimeJSONEncoder
  File "/usr/lib/python2.6/dist-packages/lazr/restfulclient/_json.py", line 28, in <module>
    class DatetimeJSONEncoder(simplejson.JSONEncoder):
AttributeError: 'module' object has no attribute 'JSONEncoder'

I tried reinstalling software-center, but the result was the same. After some googling, I also reinstalled the package python-simplejson (2.1.1-1)

Now it if starting up fine except for maybe the below output, but besides that it's ok.

pbekesi@csacsi-desktop:~$ software-center
2011-02-27 17:03:47,174 - softwarecenter.app - INFO - software-center-agent finished with status 1
WARNING: can not get name for '<gtk.TextBuffer object at 0xa3ba2d4 (GtkTextBuffer at 0xa069948)>'WARNING: can not get name for '<gtk.CellRendererText object at 0xa3ba2fc (GtkCellRendererText at 0xa0703a0)>'