Public bug reported:

when I tried to initiate the do-release-upgrade -d command, after calculating 
the upgrade -2.2 gb of downloads- It begin to download the packages. I had to 
leave the office so I disconnected the network first. it start to loop through 
the repositories and then reset the upgrade process and left safely so I turned 
off the laptop.
then I tried to do that again in my house to be faced with "cannot calculate 
the upgrade" error. no matter what I do it just pops up over and over again.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.19.0-49.55~14.04.1-generic 3.19.8-ckt12
Uname: Linux 3.19.0-49-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
Date: Sun Feb 21 13:54:24 2016
InstallationDate: Installed on 2015-10-01 (143 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-02-21 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2016-02-21 13:50:37.188988
 Log time: 2016-02-21 13:53:18.868511
 Log time: 2016-02-21 13:54:23.467569
 Log time: 2016-02-21 13:54:43.313736

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


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

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https://bugs.launchpad.net/bugs/1548055

Title:
  Can't upgrade from Trusty To Xenial with "Can't calculate the upgrade"
  error

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