Upgrading from Ubuntu 14.04 to 16.04 failed

[Melissa Rocke]

Software updater aborted the Ubuntu 16.04 upgrade due to errors with mirror

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.13.0-137.186-generic 3.13.11-ckt39
Uname: Linux 3.13.0-137-generic i686
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: i386
CrashDB: ubuntu
Date: Mon Jan 1 11:50:40 2018
InstallationDate: Installed on 2017-12-31 (1 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2018-01-01 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2018-01-01 11:38:58.033547
 Log time: 2018-01-01 11:39:27.682627
 Log time: 2018-01-01 11:45:03.297518
 Log time: 2018-01-01 11:50:56.590568
VarLogDistupgradeTermlog: