[Bug 1390574] [NEW] Trying to upgrade from 12.04 to 14.04

[H]

Public bug reported:

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
Building data structures... Done 

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This can be caused by: 
* Upgrading to a pre-release version of Ubuntu 
* Running the current pre-release version of Ubuntu 
* Unofficial software packages not provided by Ubuntu 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 


A fatal error occurred

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 has aborted. 
Your original sources.list was saved in 
/etc/apt/sources.list.distUpgrade. 

Traceback (most recent call last):

File "/tmp/update-manager-iwwUmY/trusty", line 10, in <module> 
sys.exit(main()) 

File "/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeMain.py", 
line 244, in main 
if app.run(): 

File 
"/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
line 1827, in run 
return self.fullUpgrade() 

File 
"/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
line 1781, in fullUpgrade 
self.abort() 

File 
"/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
line 1337, in abort 
self.aptcdrom.restore_backup(self.sources_backup_ext) 

AttributeError: 'AptCdrom' object has no attribute 'restore_backup'

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.17
ProcVersionSignature: Ubuntu 3.2.0-70.105-generic 3.2.63
Uname: Linux 3.2.0-70-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.7
Architecture: amd64
Date: Fri Nov  7 10:23:21 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1415383828
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 620
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2014-11-07 (0 days ago)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade precise

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https://bugs.launchpad.net/bugs/1390574

Title:
  Trying to upgrade from 12.04 to 14.04

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  Building data structures... Done 

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 


  A fatal error occurred

  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 has aborted. 
  Your original sources.list was saved in 
  /etc/apt/sources.list.distUpgrade. 

  Traceback (most recent call last):

  File "/tmp/update-manager-iwwUmY/trusty", line 10, in <module> 
  sys.exit(main()) 

  File "/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeMain.py", 
  line 244, in main 
  if app.run(): 

  File 
  "/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
  line 1827, in run 
  return self.fullUpgrade() 

  File 
  "/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
  line 1781, in fullUpgrade 
  self.abort() 

  File 
  "/tmp/update-manager-iwwUmY/DistUpgrade/DistUpgradeController.py", 
  line 1337, in abort 
  self.aptcdrom.restore_backup(self.sources_backup_ext) 

  AttributeError: 'AptCdrom' object has no attribute 'restore_backup'

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156.14.17
  ProcVersionSignature: Ubuntu 3.2.0-70.105-generic 3.2.63
  Uname: Linux 3.2.0-70-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: amd64
  Date: Fri Nov  7 10:23:21 2014
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1415383828
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 620
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2014-11-07 (0 days ago)

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