[Bug 1562392] [NEW] Update manager doesn't calculate free space correctly for distribution upgrade

[Barra]

Public bug reported:

i try do-release-upgrade -d and update-manager -d

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.16.0-67.87~14.04.1-generic 3.16.7-ckt24
Uname: Linux 3.16.0-67-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Mar 26 21:18:12 2016
InstallationDate: Installed on 2015-08-31 (208 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-03-26 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1562392

Title:
  Update manager doesn't calculate free space correctly for distribution
  upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  i try do-release-upgrade -d and update-manager -d

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.16.0-67.87~14.04.1-generic 3.16.7-ckt24
  Uname: Linux 3.16.0-67-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Mar 26 21:18:12 2016
  InstallationDate: Installed on 2015-08-31 (208 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-03-26 (0 days ago)
  VarLogDistupgradeTermlog:

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