Public bug reported:

[Test Case]
1) run update-manager --no-update
2) click to upgrade
3) authenticate
4) see release notification
5) disable network
6) click upgrade
7) Observe traceback in terminal in which you ran update-manager --no-update

Traceback (most recent call last):
  File "/usr/bin/do-release-upgrade", line 152, in <module>
    fetcher.run()
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py", 
line 278, in run
    _("Fetching the upgrade failed. There may be a network "
  File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py", line 
50, in error
    return error(self.window_main.window_main, summary, message)
AttributeError: 'NoneType' object has no attribute 'window_main'

With the version of the package from -proposed you should see a "Failed
to fetch" error message.

[Errors Bucket]
https://errors.ubuntu.com/problem/6017779ce1d880665e7459bbb40c3e2ee76e6869

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: ubuntu-release-upgrader (Ubuntu Saucy)
     Importance: High
     Assignee: Brian Murray (brian-murray)
         Status: In Progress

** Affects: ubuntu-release-upgrader (Ubuntu Trusty)
     Importance: High
         Status: Fix Released

** Also affects: ubuntu-release-upgrader (Ubuntu Saucy)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-release-upgrader (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu Trusty)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu Saucy)
       Status: New => Triaged

** Changed in: ubuntu-release-upgrader (Ubuntu Saucy)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1310851

Title:
  Failed to fetch window does not appear

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