Public bug reported:

I started a release upgrade from 16.04 to 18.04 as described in the 
BionicBeaver Release Notes, ie. enabling update notifications and then running 
"update-manager -c" and clicking the Upgrade button.
A window then appeared titled "Veröffentlichungshinweise" (German for Release 
Notes) with an error message:


Forbidden

You don't have permission to access 
/ubuntu/dists/bionic-updates/main/dist-upgrader-all/current/ReleaseAnnouncement.html
 on this server.
Apache/2.4.18 (Ubuntu) Server at archive.ubuntu.com Port 80


I cancelled the upgrade and restarted it, and ran Wireshark this time. It 
showed that the URL 
"http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dist-upgrader-all/current/ReleaseAnnouncement.html?lang%3Dde_DE%26os%3Dubuntu%26ver%3D18.04.2%20LTS";
 was accessed which resulted in an HTTP 403 error response.
Opening that URL in Firefox indeed leads to such an error page. Opening the URL 
without the parameters (ie. without the part after the question mark) leads to 
actual release notes.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-148.174-generic 4.4.177
Uname: Linux 4.4.0-148-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME-Flashback:Unity
Date: Sat May 18 22:31:00 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-08-25 (995 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

** Attachment added: "Bildschirmfoto vom 2019-05-18 22-37-10.png"
   
https://bugs.launchpad.net/bugs/1829631/+attachment/5264701/+files/Bildschirmfoto%20vom%202019-05-18%2022-37-10.png

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https://bugs.launchpad.net/bugs/1829631

Title:
  Upgrader shows "Forbidden" error in release notes window

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