cannot upgrade from 14.04 LTS to 16.04.2 LTS

[praveen dixit]

upgrade fails citing network problem, which is highly unlikely..

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.13.0-119.166-generic 3.13.11-ckt39
Uname: Linux 3.13.0-119-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue May 16 09:42:10 2017
InstallationDate: Installed on 2017-04-28 (18 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to trusty on 2017-05-15 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2017-05-15 16:42:11.867490
 Log time: 2017-05-15 16:42:26.188493
 Log time: 2017-05-15 16:58:53.883914
VarLogDistupgradeTermlog: