[Bug 1534128] Re: upgrading from 14.04 to 15.04 is failed why?

[Brian Murray]

*** This bug is a duplicate of bug 1534374 ***
    https://bugs.launchpad.net/bugs/1534374

Please install one of the following meta packages, probably ubuntu-
desktop, for the upgrade to proceed further.

2016-01-14 18:16:00,264 DEBUG none of the '['ubuntu-desktop', 'kubuntu-desktop', 'xubuntu-core', 'xubuntu-desktop', 'ubuntustudio-desktop', 'mythbuntu-desktop', 'kubuntu-netbook', 'lubuntu-core', 'lubuntu-desktop', 'ubuntu-gnome-desktop']' meta-pkgs installed
2016-01-14 18:16:00,264 DEBUG guessing 'ubuntu-desktop' as missing meta-pkg
2016-01-14 18:16:00,945 ERROR failed to mark 'ubuntu-desktop' for install (E:Unable to correct problems, you have held broken packages.)

** This bug has been marked a duplicate of bug 1534374
   unable to upgrade to 15.04 due to libstdc++6 SRU

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https://bugs.launchpad.net/bugs/1534128

Title:
  upgrading from 14.04 to 15.04 is failed why?

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

Bug description:
  i try to upgrade to ubuntu 15.04 from 14.04 LTS.when upgrading shows
  error ""Can't install 'ubuntu-desktop'

  It was impossible to install a required package. Please report this as
  a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.""

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10
  Uname: Linux 3.19.0-43-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jan 14 18:16:33 2016
  InstallationDate: Installed on 2015-12-18 (26 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-14 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-11T22:31:33.456673

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