I have followed the instructions for Ubuntu here https://graph-tool.skewed.de/download#debian to install the precompiled version of graph-tool onto my Ubuntu 15.10 system. It went okay except that I got the complaint, even after installing the key, that the graph-tool package wasn't verified. After installation, there seems to be a conflict between graph_tool and pylab. I usually start python 2.7 under ipython with ipython --pdb --pylab After doing so, the following works alright from graph_tool import Graph However, the following hangs forever: from graph_tool.all import graph_draw /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: cannot register existing type 'GtkWidget' g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: cannot add class private field to invalid type '<invalid>' g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: cannot add private field to invalid (non-instantiatable) type '<invalid>' g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: g_type_add_interface_static: assertion 'G_TYPE_IS_INSTANTIATABLE (instance_type)' failed g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: cannot register existing type 'GtkBuildable' g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: g_type_interface_add_prerequisite: assertion 'G_TYPE_IS_INTERFACE (interface_type)' failed g_type = info.get_g_type() /usr/lib/python2.7/dist-packages/gi/module.py:176: Warning: g_once_init_leave: assertion 'result != 0' failed g_type = info.get_g_type() I don't understand the errors, but possibly some test could avert the hang/crash outcome? Thanks, Chris -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.