dist-upgrader did not fallback to an official mirror of the archive

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Upgrading Ubuntu to version 18.04

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 16.04
Package: ubuntu-release-upgrader-core 1:16.04.24
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CrashDB: ubuntu
Date: Wed Apr 22 01:11:24 2020
InstallationDate: Installed on 2015-08-23 (1703 days ago)
InstallationMedia: Edubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-04-21 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-04-22 00:53:02.486717
 Log time: 2020-04-22 01:07:19.738572
 Log time: 2020-04-22 01:09:10.724109
 Log time: 2020-04-22 01:11:30.582041
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

The mirror of Ubuntu which you are using in an unofficial one and the release upgrader did not fall back to a generic one in your case. If you just want to upgrade please switch to an official mirror of the Ubuntu archive. You can find a list here:

https://launchpad.net/ubuntu/+archivemirrors