In UbiquitySyslog.txt:

Oct  7 15:35:14 ubuntu ubiquity[18324]: Traceback (most recent call last):
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1391, in 
watch_debconf_fd_helper
Oct  7 15:35:14 ubuntu ubiquity[18324]:     return callback(source, 
debconf_condition)
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 252, in process_input
Oct  7 15:35:14 ubuntu ubiquity[18324]:     self.status = self.wait()
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 148, in wait
Oct  7 15:35:14 ubuntu ubiquity[18324]:     self.cleanup()
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/ubiquity/plugins/ubi-partman.py", line 2867, in cleanup
Oct  7 15:35:14 ubuntu ubiquity[18324]:     
self.preseed('grub-installer/bootdev', self.ui.get_grub_choice())
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 342, in preseed
Oct  7 15:35:14 ubuntu ubiquity[18324]:     self.db.set(name, value)
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/python2.7/dist-packages/debconf.py", line 60, in <lambda>
Oct  7 15:35:14 ubuntu ubiquity[18324]:     lambda *args, **kw: 
self.command(command, *args, **kw))
Oct  7 15:35:14 ubuntu ubiquity[18324]:   File 
"/usr/lib/python2.7/dist-packages/debconf.py", line 64, in command
Oct  7 15:35:14 ubuntu ubiquity[18324]:     self.write.write("%s %s\n" % 
(command, ' '.join(map(str, params))))
Oct  7 15:35:14 ubuntu ubiquity[18324]: ValueError: I/O operation on closed file
Oct  7 15:35:14 ubuntu ubiquity[18324]:

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https://bugs.launchpad.net/bugs/1063292

Title:
  Downgrade from 12.10 to 12.04 appears to succeed but reports crash in
  the end

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