bug in upgrading to 18.04

[Mandri Fabrizio]

xxxx

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.29
ProcVersionSignature: Ubuntu 4.15.0-24.26~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-24-generic i686
ApportVersion: 2.20.1-0ubuntu2.21
Architecture: i386
CrashDB: ubuntu
Date: Sun Sep 27 11:42:11 2020
InstallationDate: Installed on 2017-08-05 (1148 days ago)
InstallationMedia: Lubuntu 16.04.2 LTS "Xenial Xerus" - Release i386 (20170216)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=it
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-09-27 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-09-27 11:41:41.795881
 Log time: 2020-09-27 11:41:43.184234
 Log time: 2020-09-27 11:42:03.580947
 Log time: 2020-09-27 11:42:14.138194
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

The mirror of the Ubuntu archive which you have configured is not an official one and subsequently it was disabled during the release upgrade. Please either run the release upgrade with '--allow-third-party' or switch to using an official mirror of the Ubuntu archive.

[Launchpad Janitor (janitor)]

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