assert cache._depcache.BrokenCount == 0

The installer tried to load the additional language packages, the installer crashed.

Traceback (most recent call last):
  File "/usr/bin/ubiquity", line 123, in ?
    install(sys.argv[1])
  File "/usr/bin/ubiquity", line 55, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 297, in run
    self.process_step()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 827, in process_step
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtkui.py", line 611, 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 1347, in ?
    install.run()
  File "/usr/share/ubiquity/install.py", line 335, in run
    self.install_language_packs()
  File "/usr/share/ubiquity/install.py", line 807, in install_language_packs
    self.mark_install(cache, lp)
  File "/usr/share/ubiquity/install.py", line 734, in mark_install
    assert cache._depcache.BrokenCount == 0
AssertionError