W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/main/source/Sources 404 Not Found [IP: 2001:67c:1560:8001::11 80] , fetching related

[Dhruv]

W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/main/source/Sources 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/restricted/source/Sources 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/universe/source/Sources 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/multiverse/source/Sources 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/restricted/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/main/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/universe/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/restricted/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/multiverse/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/universe/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/main/binary-i386/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/multiverse/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/restricted/binary-i386/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/universe/binary-i386/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/restricted/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/wily-security/multiverse/binary-i386/Packages 404 Not Found [IP: 2001:67c:1560:8001::11 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/universe/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/multiverse/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/restricted/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/universe/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily/multiverse/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/main/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/restricted/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/multiverse/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/restricted/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/multiverse/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/main/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/restricted/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://ppa.launchpad.net/kernel-ppa/ppa/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/kernel-ppa/ppa/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/universe/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/main/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/restricted/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/universe/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/multiverse/source/Sources 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/main/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/restricted/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/universe/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/multiverse/binary-amd64/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/main/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/restricted/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/universe/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/wily-backports/multiverse/binary-i386/Packages 404 Not Found [IP: 2001:67c:1360:8001::21 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4 [origin: unknown]
ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12
Uname: Linux 4.2.0-42-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Jan 17 23:55:02 2018
InstallationDate: Installed on 2016-07-25 (541 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
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: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)

[Paul White (paulw2u)]

Thank you for reporting this issue to Ubuntu.
The Wily (15.10) release reached EOL on 28th July 2016. The repositories that you are trying to download from have long since been moved.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases
See also https://help.ubuntu.com/community/EOLUpgrades