Updater doesn't know how to handle UnicodeDecodeError in error callback

[Gannet]

Trying to upgrade from 13.10 to 14.04, I'm getting an error:

Виникла невиправна помилка

Будь ласка, повідомте про цю помилку та додайте файли
/var/log/dist-upgrade/main.log та /var/log/dist-upgrade/apt.log до
вашого звіту. Оновлення було перервано.
Ваш оригінальний sources.list було збережено в
/etc/apt/sources.list.distUpgrade.

Traceback (most recent call last):

File "/tmp/ubuntu-release-upgrader-l5jrqb/trusty", line 10, in
<module>
sys.exit(main())

File
"/tmp/ubuntu-release-upgrader-l5jrqb/DistUpgrade/DistUpgradeMain.py",
line 243, in main
if app.run():

File
"/tmp/ubuntu-release-upgrader-l5jrqb/DistUpgrade/DistUpgradeController.py",
line 1826, in run
return self.fullUpgrade()

File
"/tmp/ubuntu-release-upgrader-l5jrqb/DistUpgrade/DistUpgradeController.py",
line 1779, in fullUpgrade
if not self.askDistUpgrade():

File
"/tmp/ubuntu-release-upgrader-l5jrqb/DistUpgrade/DistUpgradeController.py",
line 1005, in askDistUpgrade
self.cache.required_download)

File
"/tmp/ubuntu-release-upgrader-l5jrqb/DistUpgrade/DistUpgradeViewText.py",
line 172, in confirmChanges
res = sys.stdin.readline().decode(ENCODING, "backslashreplace")

File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)

TypeError: don't know how to handle UnicodeDecodeError in error
callback

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Towleeee (djdfysx)]

Try to install Unicode
apt-get install unicode
It helped me

[Alex Ankudinov (xelez0)]

Installing unicode package helped me too, thank you very much, Towleeee.

But well. Why the hell installing this package changes something in python unicode handling? HOW?????