Ubiquity 1.5.6mythbuntu14
/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:106: GtkWarning: gtk_tree_row_reference_new: assertion `GTK_IS_TREE_MODEL (model)' failed
  gladexml = gtk.glade.XML(gladefile, name)
/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py:106: GtkWarning: gtk_cell_view_set_displayed_row: assertion `GTK_IS_TREE_MODEL (cell_view->priv->model)' failed
  gladexml = gtk.glade.XML(gladefile, name)
Exception in GTK frontend (invoking crash handler):
Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 211, in <module>
    main()
  File "/usr/lib/ubiquity/bin/ubiquity", line 206, in main
    install(args[0])
  File "/usr/lib/ubiquity/bin/ubiquity", line 65, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/mythbuntu_ui.py", line 215, in run
    self.process_step()
  File "/usr/lib/ubiquity/ubiquity/frontend/mythbuntu_ui.py", line 296, in process_step
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/mythbuntu_ui.py", line 404, in progress_loop
    (ret, realtb))
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/mythbuntu_install.py", line 264, in <module>
    install.run()
  File "/usr/share/ubiquity/mythbuntu_install.py", line 123, in run
    self.configure_bootloader()
  File "/usr/share/ubiquity/install.py", line 1316, in configure_bootloader
    "GrubInstaller failed with code %d" % ret)
InstallStepError: GrubInstaller failed with code 1