Error while making upgrade from 12.04 to 14.04.4

[William Pabon]

The error reads as follows:

Error: marking the upgrade (E:Error,pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.) This usually means that your installed packages have unmet dependencies.

Is there a solution for this?
Thanks

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.19
ProcVersionSignature: Ubuntu 3.2.0-102.142-generic-pae 3.2.79
Uname: Linux 3.2.0-102-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.13
Architecture: i386
Date: Mon Jun 6 12:45:55 2016
GsettingsChanges:
 com.ubuntu.update-manager check-new-release-ignore 'trusty'
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1465231059
 com.ubuntu.update-manager window-height 518
 com.ubuntu.update-manager window-width 624
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
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 2016-06-06 (0 days ago)
VarLogDistupgradeTermlog: