edgy: GUI gnome-app-install get stuck

Binary package hint: gnome-app-install

after an dapper to edgy upgrade, if i want to install new software the GUI gnome-app-install is looking for already installed components and then get stuck.

I made a screenshot, so you can see what i mean:
http://img349.imageshack.us/img349/6558/buntuar9.gif

what the terminal says during the process:
[code]
xxx@xxx:~$ gnome-app-install
Introspect error: The name org.freedesktop.AppInstall was not provided by any .service files
no listening object (The name org.freedesktop.AppInstall was not provided by any .service files)

** (gnome-app-install:9769): WARNING **: return value of custom widget handler was not a GtkWidget
/usr/lib/python2.4/site-packages/AppInstall/Progress.py:40: GtkWarning: Failed to set text from markup due to error parsing markup: Fehler in Zeile 1, Zeichen 9: UngÃŒltiger UTF-8-kodierter Text
  self.label_action.set_markup("<i>"+"%s" % self.subOp+"</i>")
/usr/lib/python2.4/site-packages/AppInstall/AppInstall.py:1270: GtkWarning: gtk_tree_model_sort_sort: assertion `tree_model_sort->default_sort_func != NULL' failed
  item.applications.set_default_sort_func(None)
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/AppInstall/AppInstall.py", line 1287, in on_treeview_packages_cursor_changed
    self.show_description(item)
  File "/usr/lib/python2.4/site-packages/AppInstall/AppInstall.py", line 1059, in show_description
    rough_desc = pkg.description.rstrip(" \n\t")
  File "/usr/lib/python2.4/site-packages/apt/package.py", line 169, in description
    for line in string.split(unicode(self._records.LongDesc,"utf-8"),"\n"):
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 94-96: invalid data
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/AppInstall/AppInstall.py", line 1287, in on_treeview_packages_cursor_changed
    self.show_description(item)
  File "/usr/lib/python2.4/site-packages/AppInstall/AppInstall.py", line 1059, in show_description
    rough_desc = pkg.description.rstrip(" \n\t")
  File "/usr/lib/python2.4/site-packages/apt/package.py", line 169, in description
    for line in string.split(unicode(self._records.LongDesc,"utf-8"),"\n"):
UnicodeDecodeError: 'utf8' codec can't decode bytes in position 94-96: invalid data
[/code]

i tried:

sudo aptitude reinstall gnome-app-instal

then i deleted "death" sources from my sourcelist and the problem supposed to be fixed.
But now it comes again and again. The guys on my ubuntu-community recommented to make a bug-report here. I hope it helps.

best regards and thanks for you great work, calvin2kger!