In UbiquitySyslog.txt:

ul 22 15:11:11 ubuntu ubiquity[15722]: log-output -t ubiquity debconf-copydb 
configdb targetdb -p ^console-setup/ --config=Name:targetdb 
--config=Driver:File --config=Mode:0644 
--config=Filename:/target/var/cache/debconf/config.dat
Jul 22 15:11:28 ubuntu ubiquity[15722]: Exception in GTK frontend (invoking 
crash handler):
Jul 22 15:11:28 ubuntu ubiquity[15722]: Traceback (most recent call last):
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1449, in 
watch_debconf_fd_helper
Jul 22 15:11:28 ubuntu ubiquity[15722]:     return callback(source, 
debconf_condition)
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 257, in process_input
Jul 22 15:11:28 ubuntu ubiquity[15722]:     self.status = self.wait()
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 153, in wait
Jul 22 15:11:28 ubuntu ubiquity[15722]:     self.cleanup()
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/ubiquity/plugins/ubi-partman.py", line 2989, in cleanup
Jul 22 15:11:28 ubuntu ubiquity[15722]:     
self.preseed('grub-installer/bootdev', self.ui.get_grub_choice())
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 348, in preseed
Jul 22 15:11:28 ubuntu ubiquity[15722]:     self.db.set(name, value)
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/python3/dist-packages/debconf.py", line 62, in <lambda>
Jul 22 15:11:28 ubuntu ubiquity[15722]:     lambda *args, **kw: 
self.command(command, *args, **kw))
Jul 22 15:11:28 ubuntu ubiquity[15722]:   File 
"/usr/lib/python3/dist-packages/debconf.py", line 66, in command
Jul 22 15:11:28 ubuntu ubiquity[15722]:     self.write.write("%s %s\n" % 
(command, ' '.join(map(str, params))))
Jul 22 15:11:28 ubuntu ubiquity[15722]: ValueError: I/O operation on closed 
file.
Jul 22 15:11:28 ubuntu ubiquity[15722]: 
Jul 22 15:11:44 ubuntu wpa_supplicant[2987]: wlan0: WPA: Group rekeying 
completed with 00:1c:28:aa:09:d7 [GTK=TKIP]

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https://bugs.launchpad.net/bugs/1027648

Title:
  ubiquity crashed with ValueError in command(): I/O operation on closed
  file.

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