Public bug reported:
As of 18.04, it seems that support for the GTKCairo and GTKAgg (GTK2)
backends for matplotlib (2.1.1-2ubuntu3) are broken.
To demonstrate, the following runs without error on 16.04, but produces
error messages (see below*) on 18.04:
ipython
import matplotlib; matplotlib.use('GTKAgg')
import pylab
The final error message is "ImportError: No module named _backend_gdk".
It is clear that the _backend_gdk file is not provided in the python-
matplotlib package, whereas it was in Ubuntu 16.04; see below from 'dpkg
-L python-matplotlib':
/usr/lib/python2.7/dist-packages/matplotlib/backends/_backend_gdk.x86_64
-linux-gnu.so
It seems that the Build-Depends for python-matplotlib should perhaps include
python-gtk2-dev in order to resolve this problem:
https://stackoverflow.com/questions/14346090/importerror-no-module-named-backend-gdk
*Error messages note above:
Gtk-Message: 17:45:01.751: Failed to load module "canberra-gtk-module"
(ipython:10617): dbind-WARNING **: 17:45:01.756: Couldn't register with
accessibility bus: Did not receive a reply. Possible causes include: the remote
application did not send a reply, the message bus security policy blocked the
reply, the reply timeout expired, or the network connection was broken.
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-2-a18b8f3c2edd> in <module>()
----> 1 import pylab
/usr/lib/python2.7/dist-packages/pylab.py in <module>()
----> 1 from matplotlib.pylab import *
2 import matplotlib.pylab
3 __doc__ = matplotlib.pylab.__doc__
/usr/lib/python2.7/dist-packages/matplotlib/pylab.py in <module>()
255 window_hanning, window_none)
256
--> 257 from matplotlib import cbook, mlab, pyplot as plt
258 from matplotlib.pyplot import *
259
/usr/lib/python2.7/dist-packages/matplotlib/pyplot.py in <module>()
114 ## Global ##
115
--> 116 _backend_mod, new_figure_manager, draw_if_interactive, _show =
pylab_setup()
117
118 _IP_REGISTERED = None
/usr/lib/python2.7/dist-packages/matplotlib/backends/__init__.pyc in
pylab_setup(name)
58 # imports. 0 means only perform absolute imports.
59 backend_mod = __import__(backend_name, globals(), locals(),
---> 60 [backend_name], 0)
61
62 # Things we pull in from all backends
/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_gtkagg.py in
<module>()
12 from matplotlib.figure import Figure
13 from matplotlib.backends.backend_agg import FigureCanvasAgg
---> 14 from matplotlib.backends.backend_gtk import (
15 gtk, _BackendGTK, FigureCanvasGTK, FigureManagerGTK,
NavigationToolbar2GTK,
16 backend_version, error_msg_gtk, PIXELS_PER_INCH)
/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk.py in
<module>()
33 TimerBase, cursors)
34
---> 35 from matplotlib.backends.backend_gdk import RendererGDK, FigureCanvasGDK
36 from matplotlib.cbook import is_writable_file_like, warn_deprecated
37 from matplotlib.figure import Figure
/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_gdk.py in
<module>()
31 from matplotlib.mathtext import MathTextParser
32 from matplotlib.transforms import Affine2D
---> 33 from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
34
35 backend_version = "%d.%d.%d" % gtk.pygtk_version
ImportError: No module named _backend_gdk
** Affects: matplotlib (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1785458
Title:
Support for GTK2 backends broken (18.04 bionic)
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