Public bug reported:

When upgrading from 25.10 to 26.04 ,

do-release-upgrade -d

```
I am getting the following error: 

Calculating snap size requirements

Updating repository information
Hit http://archive.ubuntu.com/ubuntu resolute InRelease
Hit http://security.ubuntu.com/ubuntu resolute-security InRelease
Hit http://archive.ubuntu.com/ubuntu resolute-updates InRelease
Hit http://archive.ubuntu.com/ubuntu resolute-backports InRelease
Fetched 0 B in 0s (0 B/s)

Checking package manager
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done

Foreign Packages Installed

The following unofficial packages are currently installed:

libssl3t64...............Installed from: unknown origin
openssl..................Installed from: unknown origin
openssl-provider-legacy..Installed from: unknown origin


It is recommended to install supported versions from the Ubuntu
archive, and try the upgrade again.

Do you want to continue the upgrade anyways?

Continue [yN] 
```

ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: ubuntu-release-upgrader-core 1:25.10.8
ProcVersionSignature: Ubuntu 6.17.0-14.14-generic 6.17.9
Uname: Linux 6.17.0-14-generic x86_64
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
 644:0:109:296:2026-03-02 07:46:15.025794113 +0530:2025-09-10 
23:02:32.610067130 +0530:/var/crash/kexec_cmd
 644:0:109:0:2026-03-02 07:46:10.930845594 +0530:2026-03-02 07:46:10.880846222 
+0530:/var/crash/kdump_lock
 640:0:109:26632:2026-02-27 14:46:33.692268786 +0530:2026-02-27 
04:41:19.823522229 +0530:/var/crash/_usr_bin_do-release-upgrade.0.crash
CurrentDesktop: GNOME
Date: Mon Mar  2 07:48:49 2026
InstallationDate: Installed on 2025-03-28 (338 days ago)
InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to questing on 2026-03-02 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2026-03-02 07:47:28.560615
 Log time: 2026-03-02 07:47:30.555614
 Log time: 2026-03-02 07:47:55.096032

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


** Tags: amd64 apport-bug dist-upgrade questing third-party-packages 
wayland-session

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https://bugs.launchpad.net/bugs/2143014

Title:
  unable to upgrade from 25.10 to 26.04

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