"import gtk" fails with TypeError: type 'gio.MemoryOutputStream' is not dynamically allocated but its base type '__main__.GPollableOutputStream' is dynamically allocated

[Denis Washington]

On today's Ubuntu vivid (freshly installed from daily image), any pygtk app fails on "import gtk" (more specifically, the nested "import gio") with the following output (taking Dropbox as an example)

$ dropbox start -i
Starting Dropbox...
** (process:15699): WARNING **: couldn't make the type `gio.MemoryInputStream' ready

** (process:15699): WARNING **: couldn't make the type `gio.MemoryOutputStream' ready
TypeError: type 'gio.MemoryOutputStream' is not dynamically allocated but its base type '__main__.GPollableOutputStream' is dynamically allocated

** (process:15699): WARNING **: couldn't make the type `gio.unix.InputStream' ready

** (process:15699): WARNING **: couldn't make the type `gio.unix.OutputStream' ready
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: RuntimeWarning: tp_compare didn't return -1 or -2 for exception
  from gtk import _gtk
ImportError: could not import gio
ImportError: could not import gio
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1257, in start
    download()
  File "/usr/bin/dropbox", line 338, in download
    class DownloadDialog(gtk.Dialog):
AttributeError: 'module' object has no attribute 'Dialog'

[dino99 (9d9)]

like lp:1426229 and some others

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.