Upgrade tool not working

[vaibhav]

I unable to upgrade from Ubuntu 14.10 to 16.04.

Invalid package information

After updating your package information, the essential package
'ubuntu-minimal' could not be located. This may be because you have
no official mirrors listed in your software sources, or because of
excessive load on the mirror you are using. See /etc/apt/sources.list
for the current list of configured software sources.
In the case of an overloaded mirror, you may want to try the upgrade
again later.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9 [origin: unknown]
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: Fri Dec 8 13:29:20 2017
InstallationDate: Installed on 2013-08-05 (1585 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2017-12-08 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2017-12-08 13:28:36.965336
 Log time: 2017-12-08 13:28:57.369481
 Log time: 2017-12-08 13:29:19.524253
 Log time: 2017-12-08 13:29:25.942657