Public bug reported:
I tried to upgrade my Xubuntu 24.04 to 26.04 with this command:
sudo do-release-upgrade -d
The end of the process I got this messages:
"Módosítások előkészítése
A frissítés előkészítése sikertelen
Megoldhatatlan probléma merült fel a frissítés kiszámítása során."
In English:
"Preparing Updates
Failed to prepare the update
An unsolvable problem occurred while calculating the update."
I found references to a few applications in the main.log file, and I
removed most of them using the Synaptic package manager.
"2026-09-21 18:56:53,670 DEBUG Foreign (before rewriting sources):
cursor librewolf sublime-text wine-stable wine-stable-amd64 wine-
stable-i386:i386 winehq-stable"
The removed applications are:
LibreWolf 156.0-1
cursor 3.21.16
wine-stable wine-stable-amd64 wine-stable-i386:i386 winehq-stable
The distribution update keeps getting stuck just like before.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.29
ProcVersionSignature: Ubuntu 7.0.0-31.31~24.04.1-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CrashDB: ubuntu
CrashReports:
640:1000:123:12922799:2026-09-15 14:08:12.256444547 +0200:2026-09-15
14:08:07.623341141 +0200:/var/crash/_usr_share_cursor_cursor.1000.crash
640:1000:123:28156861:2026-09-19 12:25:13.974031999 +0200:2026-09-19
12:25:09.681942257 +0200:/var/crash/_usr_bin_transmission-gtk.1000.crash
640:1000:123:7866726:2026-09-19 11:11:19.349916654 +0200:2026-09-19
11:11:15.582832561 +0200:/var/crash/_usr_bin_pcmanfm.1000.crash
CurrentDesktop: XFCE
Date: Tue Sep 22 12:42:57 2026
InstallationDate: Installed on 2025-07-03 (446 days ago)
InstallationMedia: Xubuntu 24.04.2 LTS "Noble Numbat" - Release amd64
(20250215.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to noble on 2026-09-21 (1 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade noble
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https://bugs.launchpad.net/bugs/2167935
Title:
I got this message at the end of dist upgrade: "The update failed to
prepare."
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