upgrade issue 16 to 18

[SAHIL SHAIKH]

upgrade issue ubantu 16 to ubantu 18

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
Uname: Linux 5.4.0 x86_64
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
CrashDB: ubuntu
Date: Tue Jul 7 12:38:46 2020
InstallationDate: Installed on 2019-03-15 (480 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-07-07 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-07-07 12:38:20.385541
 Log time: 2020-07-07 12:38:21.469659
 Log time: 2020-07-07 12:38:38.189249
 Log time: 2020-07-07 12:38:48.764570
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

There was a problem communicating with the mirror of Ubuntu archive which you use. This is an issue you'll need to sort out manually.

2020-07-07 12:38:33,414 DEBUG examining: 'deb http://172.16.5.4/ubuntu xenial universe'
2020-07-07 12:38:33,415 DEBUG verifySourcesListEntry: deb http://172.16.5.4/ubuntu bionic universe
2020-07-07 12:38:33,415 DEBUG url_downloadable: http://172.16.5.4/ubuntu/dists/bionic/Release
2020-07-07 12:38:33,415 DEBUG s='http' n='172.16.5.4' p='/ubuntu/dists/bionic/Release' q='' f=''
2020-07-07 12:38:33,423 DEBUG error from httplib: 'HTTP Error 404: Not Found'

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]