*** This bug is a duplicate of bug 221023 ***
    https://bugs.launchpad.net/bugs/221023

$ sudo apt-get install update-manager-core
-- installed correctly

but then after a while:
$ sudo do-release-upgrade -d -m desktop

the only warning on the stdin:
WARNING: Failed to read mirror file

it stops on: 
Calculating the changes

Your system is up-to-date

There are no upgrades available for your system. The upgrade will now
be canceled.


Do you want to start the upgrade?


A fatal error occured

Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade aborts now.
Your original sources.list was saved in
/etc/apt/sources.list.distUpgrade.

Traceback (most recent call last):

File "/tmp/tmpOyIw3S/hardy", line 60, in ?
app.run()

File "/tmp/tmpOyIw3S/DistUpgradeController.py", line 1550, in run
self.fullUpgrade()

File "/tmp/tmpOyIw3S/DistUpgradeController.py", line 1513, in
fullUpgrade
if not self.askDistUpgrade():

File "/tmp/tmpOyIw3S/DistUpgradeController.py", line 818, in
askDistUpgrade
self.cache.requiredDownload)

File "/tmp/tmpOyIw3S/DistUpgradeViewText.py", line 170, in
confirmChanges
print twrap(self.confirmChangesMessage)

AttributeError: 'DistUpgradeViewText' object has no attribute
'confirmChangesMessage'


** Attachment added: "the logs asked by do-release-upgrade error"
   http://launchpadlibrarian.net/14016597/dist-upgrade.log.tar.gz

-- 
AttributeError: 'DistUpgradeViewGtk' object has no attribute 
'confirmChangesMessage'
https://bugs.launchpad.net/bugs/224161
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