do-release-update crashes on lines 126-127

[Andreev Alexandr]

When I tried to upgrade my Xubuntu 14.10 to Xubuntu 15.04, I got a message:

-------------------------------------------------------------------------------------------------
Проверка наличия нового релиза Ubuntu
Ваша версия Ubuntu больше не поддерживается.
Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 127, in <module>
    "%(url)s\n") % { 'url' : url })
ValueError: unsupported format character '?' (0xa) at index 55
-------------------------------------------------------------------------------------------------

Then I searched through the internet and solved this problem. The solution for me was to edit with "gedit" file "/usr/bin/do-release-upgrade" and change lines 126 and 127:

From
----------------------------------------------------------------------------
print(_("For upgrade information, please visit:\n"
 "%(url)s\n") % { 'url' : url })
----------------------------------------------------------------------------

To
------------------------------------------------------------------------------------------------------------------
print(_("For upgrade information, please visit:\n %(url)s\n") % { 'url' : url })
------------------------------------------------------------------------------------------------------------------

And after that, do-release-upgrade successfully started upgrading Xubuntu.

[Launchpad Janitor (janitor)]

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

[Boris Malkov (hikari968)]

I've tried to upgrade from 16.10 to 17.04 and got the same error.

Changed /usr/sbin/do-release-upgrade from

    print(_("For upgrade information, please visit:\n"
            "%(url)s\n") % { 'url' : url })

to

    print(_("For upgrade information, please visit:\n %(url)s\n") % { 'url' : url })

and upgrade have started.

Ubuntu - ignoring bugs over centuries! ))

[Igor Starikov (idlesign)]

The same on trying to upgrade from 17.10 to 18.04.1

#2 helped

The issue may somehow be related to gettext with certain locales.