installer crash

Binary package hint: ubiquity

Gui works well until this message:
ubiquity v.1.2.5
ubuntu 6.10

Traceback (most recent call last):
  File "/usr/bin/ubiquity", line 166, in ?
    main()
  File "/usr/bin/ubiquity", line 161, in main
    install(sys.argv[1])
  File "/usr/bin/ubiquity", line 57, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 305, in run
    self.process_step()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 856, in process_step
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 628, in progress_loop
    raise RuntimeError, ("Install failed with exit code %s\n%s" %
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/install.py", line 1404, in ?
    install.run()
  File "/usr/share/ubiquity/install.py", line 355, in run
    self.install_language_packs()
  File "/usr/share/ubiquity/install.py", line 836, in install_language_packs
    self.mark_install(cache, lp)
  File "/usr/share/ubiquity/install.py", line 763, in mark_install
    assert cache._depcache.BrokenCount == 0
AssertionError