Public bug reported:

Noble-to-Resolute LTS upgrade aborts: ESM Apps libde265 package returns
HTTP 404

Ubuntu 24.04.5 LTS to Ubuntu 26.04.1 LTS upgrade aborted during
downloads.

Ubuntu Pro esm-apps, esm-infra and livepatch are enabled. The installed
libde265-0 is 1.0.15-1ubuntu0.1 from noble-updates/noble-security.

Release-upgrader 26.04.25 selected libde265-0 for upgrade. The retained 
resolute-apps-security Packages index advertises version 1.0.16-1ubuntu0.1~esm1 
and this filename:
pool/main/libd/libde265/libde265-0_1.0.16-1ubuntu0.1~esm1_amd64.deb

The download returned HTTP 404 three times, across 2001:67c:1562::21 and 
2001:67c:1562::22:
https://esm.ubuntu.com/apps/ubuntu/pool/main/libd/libde265/libde265-0_1.0.16-1ubuntu0.1%7eesm1_amd64.deb

The signed InRelease Date is Wed, 07 Oct 2026 15:14:20 UTC. Please
investigate whether the target ESM Apps package index and package-
serving endpoint are inconsistent. The client logs cannot determine
whether this is stale published metadata, archive synchronization, or
URL handling.

Expected: every package advertised by the target ESM index is downloadable, 
allowing the LTS upgrade to complete.
Actual: download fails with HTTP 404 and upgrade aborts. Noble sources were 
restored.

The run also displayed eight foreign packages associated with ESM Apps,
consistent with bug #2168979. That warning may be separate from this
download failure.

Attached diagnostics are limited to the upgrade main and APT logs.
Personal usernames, home paths, hostname and email addresses have been
redacted. No repositories, Pro settings or installed packages were
changed during diagnosis, and the upgrade has not been retried.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.29
ProcVersionSignature: Ubuntu 7.0.0-38.38~24.04.4-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
Date: Thu Oct  8 12:18:45 2026
InstallationDate: Installed on 2025-10-11 (363 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 
(20250805.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Title: Noble-to-Resolute LTS upgrade aborts: ESM Apps libde265 package returns 
HTTP 404
UpgradeStatus: Upgraded to noble on 2026-10-08 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade noble wayland-session

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https://bugs.launchpad.net/bugs/2170239

Title:
  Noble-to-Resolute LTS upgrade aborts: ESM Apps libde265 package
  returns HTTP 404

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