Public bug reported:

Ubuntu Studio fails to upgrade from 24.04.5 LTS to 26.04.1 LTS.
Nothing useful is provided in the error and the logs show too many conflicts to 
make any sense what I should do. I'm not holding any packages. I rarely used 
this installation and have not installed anything in the past few years, but I 
have upgraded it many times and it could be around 10 years old.

lsb_release -rd
No LSB modules are available.
Description:    Ubuntu 24.04.5 LTS
Release:        24.04

do-release-upgrade
Checking for a new Ubuntu release

= Welcome to Ubuntu 26.04 LTS 'Resolute Raccoon' =

The Ubuntu team is proud to announce Ubuntu 26.04 LTS 'Resolute
Raccoon'.

To see what's new in this release, visit:

  https://documentation.ubuntu.com/release-notes/26.04/

Ubuntu is a Linux distribution for your desktop or server. It is fast
and easy to install, it has regular releases, a tight selection of
excellent applications installed by default, and almost any other
software you can imagine available through the network.

We hope you enjoy Ubuntu.


== Feedback and helping ==

To help shape Ubuntu, look at the list of ways to participate at:

  https://documentation.ubuntu.com/project/community/contribute/

Your comments, bug reports, patches, and suggestions help ensure our
next release is the best release of Ubuntu ever. If you found a bug,
please read:

  https://help.ubuntu.com/community/ReportingBugs

Then report bugs using apport in Ubuntu. For example:

  ubuntu-bug linux

opens a bug report in Launchpad regarding the linux package.

If you have a question, or if you think you may have found a bug but aren't
sure, reach out on one of the communication channels. Matrix is the go-to
for instant chatting, while Discourse is the home to our support forum.
Otherwise, send an email to the Ubuntu Users mailing list:

  https://documentation.ubuntu.com/project/community/contributors/matrix/
  https://discourse.ubuntu.com/t/welcome-to-support-and-help
  https://lists.ubuntu.com/mailman/listinfo/ubuntu-users


== More information ==

You can find out more about Ubuntu on the Ubuntu website and in Ubuntu
Project documentation:

  https://ubuntu.com/
  https://documentation.ubuntu.com/project/

To sign up for future Ubuntu announcements, subscribe to Ubuntu's very
low-volume announcement list:

  https://lists.ubuntu.com/mailman/listinfo/ubuntu-announce


Continue [yN] y
Get:1 Upgrade tool signature [833 B]                                            
                                            
Get:2 Upgrade tool [961 kB]                                                     
                                            
Fetched 962 kB in 0s (0 B/s)                                                    
                                            
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcherCore.py:237: 
Warning: W:Download is performed unsandboxed as root, as file 
'resolute.tar.gz.gpg' couldn't be accessed by user '_apt'. - pkgAcquire::Run 
(13: Permission denied)
  result = fetcher.run()
authenticate 'resolute.tar.gz' against 'resolute.tar.gz.gpg' 
extracting 'resolute.tar.gz'

Reading cache

Checking package manager

Continue running under SSH?

This session appears to be running under SSH. It is not recommended 
to perform a upgrade over SSH currently because in case of failure it 
is harder to recover. 

If you continue, an additional SSH daemon will be started at port 
'1022'. 
Do you want to continue? 

Continue [yN] y

Starting additional sshd

To make recovery in case of failure easier, an additional sshd will 
be started on port '1022'. If anything goes wrong with the running 
ssh you can still connect to the additional one. 
If you run a firewall, you may need to temporarily open this port. As 
this is potentially dangerous it's not done automatically. You can 
open the port with e.g.: 
'iptables -I INPUT -p tcp --dport 1022 -j ACCEPT' 

To continue please press [ENTER]

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Hit http://bg.archive.ubuntu.com/ubuntu noble InRelease                         
                                            
Hit http://bg.archive.ubuntu.com/ubuntu noble-updates InRelease                 
                                            
Hit http://bg.archive.ubuntu.com/ubuntu noble-backports InRelease               
                                            
Hit http://security.ubuntu.com/ubuntu noble-security InRelease                  
                                            
Hit https://packages.microsoft.com/repos/code stable InRelease                  
                                            
Fetched 0 B in 0s (0 B/s)                                                       
                                            
Reading package lists... Done    
Building dependency tree... Done 
Reading state information... Done

Checking for installed snaps

Calculating snap size requirements

Updating repository information
Get:1 http://bg.archive.ubuntu.com/ubuntu resolute InRelease [136 kB]           
                                            
Get:2 http://security.ubuntu.com/ubuntu resolute-security InRelease [137 kB]    
                                            
Get:3 http://bg.archive.ubuntu.com/ubuntu resolute-updates InRelease [137 kB]   
                                            
Get:4 http://bg.archive.ubuntu.com/ubuntu resolute-backports InRelease [137 kB] 
                                            
Get:5 http://bg.archive.ubuntu.com/ubuntu resolute/main i386 Packages [1069 kB] 
                                            
Get:6 http://bg.archive.ubuntu.com/ubuntu resolute/main amd64 Packages [1480 
kB]                                            
Get:7 http://bg.archive.ubuntu.com/ubuntu resolute/main Translation-en [524 kB] 
                                            
Get:8 http://bg.archive.ubuntu.com/ubuntu resolute/main amd64 Components [395 
kB]                                           
Get:9 http://bg.archive.ubuntu.com/ubuntu resolute/main Icons (48x48) [82,8 kB] 
                                            
Get:10 http://bg.archive.ubuntu.com/ubuntu resolute/main Icons (64x64) [117 kB] 
                                            
Get:11 http://bg.archive.ubuntu.com/ubuntu resolute/main Icons (64x64@2) [33,5 
kB]                                          
Get:12 http://bg.archive.ubuntu.com/ubuntu resolute/main Icons (128x128) [261 
kB]                                           
Get:13 http://bg.archive.ubuntu.com/ubuntu resolute/main amd64 c-n-f Metadata 
[32,4 kB]                                     
Get:14 http://bg.archive.ubuntu.com/ubuntu resolute/restricted i386 Packages 
[13,6 kB]                                      
Get:15 http://bg.archive.ubuntu.com/ubuntu resolute/restricted amd64 Packages 
[152 kB]                                      
Get:16 http://bg.archive.ubuntu.com/ubuntu resolute/restricted Translation-en 
[25,8 kB]                                     
Get:17 http://bg.archive.ubuntu.com/ubuntu resolute/restricted amd64 Components 
[556 B]                                     
Get:18 http://bg.archive.ubuntu.com/ubuntu resolute/restricted Icons (48x48) 
[29 B]                                         
Get:19 http://bg.archive.ubuntu.com/ubuntu resolute/restricted Icons (64x64) 
[29 B]                                         
Get:20 http://bg.archive.ubuntu.com/ubuntu resolute/restricted Icons (64x64@2) 
[29 B]                                       
Get:21 http://bg.archive.ubuntu.com/ubuntu resolute/restricted Icons (128x128) 
[29 B]                                       
Get:22 http://bg.archive.ubuntu.com/ubuntu resolute/restricted amd64 c-n-f 
Metadata [388 B]                                 
Get:23 http://bg.archive.ubuntu.com/ubuntu resolute/universe i386 Packages 
[8511 kB]                                        
Get:24 http://security.ubuntu.com/ubuntu resolute-security/main i386 Packages 
[229 kB]                                      
Get:25 http://security.ubuntu.com/ubuntu resolute-security/main amd64 Packages 
[597 kB]                                     
Get:26 http://bg.archive.ubuntu.com/ubuntu resolute/universe amd64 Packages 
[16,0 MB]                                       
Get:27 http://security.ubuntu.com/ubuntu resolute-security/main Translation-en 
[137 kB]                                     
Get:28 http://security.ubuntu.com/ubuntu resolute-security/main amd64 
Components [46,7 kB]                                  
Get:29 http://security.ubuntu.com/ubuntu resolute-security/main Icons (48x48) 
[20,8 kB]                                     
Get:30 http://security.ubuntu.com/ubuntu resolute-security/main Icons (64x64) 
[29,3 kB]                                     
Get:31 http://security.ubuntu.com/ubuntu resolute-security/main Icons (64x64@2) 
[29 B]                                      
Get:32 http://security.ubuntu.com/ubuntu resolute-security/main Icons (128x128) 
[61,1 kB]                                   
Get:33 http://security.ubuntu.com/ubuntu resolute-security/main amd64 c-n-f 
Metadata [4616 B]                               
Get:34 http://security.ubuntu.com/ubuntu resolute-security/restricted i386 
Packages [14,3 kB]                               
Get:35 http://security.ubuntu.com/ubuntu resolute-security/restricted amd64 
Packages [474 kB]                               
Get:36 http://security.ubuntu.com/ubuntu resolute-security/restricted 
Translation-en [96,3 kB]                              
Get:37 http://security.ubuntu.com/ubuntu resolute-security/restricted amd64 
Components [212 B]                              
Get:38 http://security.ubuntu.com/ubuntu resolute-security/restricted Icons 
(48x48) [29 B]                                  
Get:39 http://security.ubuntu.com/ubuntu resolute-security/restricted Icons 
(64x64) [29 B]                                  
Get:40 http://security.ubuntu.com/ubuntu resolute-security/restricted Icons 
(64x64@2) [29 B]                                
Get:41 http://security.ubuntu.com/ubuntu resolute-security/restricted Icons 
(128x128) [29 B]                                
Get:42 http://security.ubuntu.com/ubuntu resolute-security/restricted amd64 
c-n-f Metadata [396 B]                          
Get:43 http://security.ubuntu.com/ubuntu resolute-security/universe amd64 
Packages [199 kB]                                 
Get:44 http://security.ubuntu.com/ubuntu resolute-security/universe i386 
Packages [113 kB]                                  
Get:45 http://security.ubuntu.com/ubuntu resolute-security/universe 
Translation-en [64,8 kB]                                
Get:46 http://security.ubuntu.com/ubuntu resolute-security/universe amd64 
Components [55,5 kB]                              
Get:47 http://security.ubuntu.com/ubuntu resolute-security/universe Icons 
(48x48) [17,3 kB]                                 
Get:48 http://security.ubuntu.com/ubuntu resolute-security/universe Icons 
(64x64) [26,3 kB]                                 
Get:49 http://security.ubuntu.com/ubuntu resolute-security/universe Icons 
(64x64@2) [29 B]                                  
Get:50 http://security.ubuntu.com/ubuntu resolute-security/universe Icons 
(128x128) [41,9 kB]                               
Get:51 http://security.ubuntu.com/ubuntu resolute-security/universe amd64 c-n-f 
Metadata [3552 B]                           
Get:52 http://security.ubuntu.com/ubuntu resolute-security/multiverse amd64 
Packages [10,8 kB]                              
Get:53 http://security.ubuntu.com/ubuntu resolute-security/multiverse i386 
Packages [2412 B]                                
Get:54 http://security.ubuntu.com/ubuntu resolute-security/multiverse 
Translation-en [2844 B]                               
Get:55 http://security.ubuntu.com/ubuntu resolute-security/multiverse amd64 
Components [212 B]                              
Get:56 http://security.ubuntu.com/ubuntu resolute-security/multiverse Icons 
(48x48) [29 B]                                  
Get:57 http://security.ubuntu.com/ubuntu resolute-security/multiverse Icons 
(64x64) [29 B]                                  
Get:58 http://security.ubuntu.com/ubuntu resolute-security/multiverse Icons 
(64x64@2) [29 B]                                
Get:59 http://security.ubuntu.com/ubuntu resolute-security/multiverse Icons 
(128x128) [29 B]                                
Get:60 http://security.ubuntu.com/ubuntu resolute-security/multiverse amd64 
c-n-f Metadata [120 B]                          
Get:61 http://bg.archive.ubuntu.com/ubuntu resolute/universe Translation-en 
[6329 kB]                                       
Get:62 http://bg.archive.ubuntu.com/ubuntu resolute/universe amd64 Components 
[4556 kB]                                     
Get:63 http://bg.archive.ubuntu.com/ubuntu resolute/universe Icons (48x48) 
[3633 kB]                                        
Get:64 http://bg.archive.ubuntu.com/ubuntu resolute/universe Icons (64x64) 
[7483 kB]                                        
Get:65 http://bg.archive.ubuntu.com/ubuntu resolute/universe Icons (64x64@2) 
[122 kB]                                       
Get:66 http://bg.archive.ubuntu.com/ubuntu resolute/universe Icons (128x128) 
[11,6 MB]                                      
Get:67 http://bg.archive.ubuntu.com/ubuntu resolute/universe amd64 c-n-f 
Metadata [313 kB]                                  
Get:68 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse i386 Packages 
[135 kB]                                       
Get:69 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse amd64 Packages 
[290 kB]                                      
Get:70 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse Translation-en 
[127 kB]                                      
Get:71 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse amd64 Components 
[50,0 kB]                                   
Get:72 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse Icons (48x48) 
[76,4 kB]                                      
Get:73 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse Icons (64x64) 
[179 kB]                                       
Get:74 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse Icons (64x64@2) 
[904 B]                                      
Get:75 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse Icons (128x128) 
[318 kB]                                     
Get:76 http://bg.archive.ubuntu.com/ubuntu resolute/multiverse amd64 c-n-f 
Metadata [8276 B]                                
Get:77 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main i386 Packages 
[327 kB]                                     
Get:78 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main amd64 Packages 
[731 kB]                                    
Get:79 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main Translation-en 
[172 kB]                                    
Get:80 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main amd64 
Components [97,7 kB]                                 
Get:81 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main Icons (48x48) 
[28,8 kB]                                    
Get:82 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main Icons (64x64) 
[39,7 kB]                                    
Get:83 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main Icons 
(64x64@2) [29 B]                                     
Get:84 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main Icons 
(128x128) [82,2 kB]                                  
Get:85 http://bg.archive.ubuntu.com/ubuntu resolute-updates/main amd64 c-n-f 
Metadata [5756 B]                              
Get:86 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted i386 
Packages [14,3 kB]                              
Get:87 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted amd64 
Packages [490 kB]                              
Get:88 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted 
Translation-en [97,7 kB]                             
Get:89 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted amd64 
Components [212 B]                             
Get:90 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted Icons 
(48x48) [29 B]                                 
Get:91 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted Icons 
(64x64) [29 B]                                 
Get:92 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted Icons 
(64x64@2) [29 B]                               
Get:93 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted Icons 
(128x128) [29 B]                               
Get:94 http://bg.archive.ubuntu.com/ubuntu resolute-updates/restricted amd64 
c-n-f Metadata [392 B]                         
Get:95 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe amd64 
Packages [322 kB]                                
Get:96 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe i386 
Packages [170 kB]                                 
Get:97 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe 
Translation-en [105 kB]                                
Get:98 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe amd64 
Components [201 kB]                              
Get:99 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe Icons 
(48x48) [55,0 kB]                                
Get:100 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe Icons 
(64x64) [93,0 kB]                               
Get:101 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe Icons 
(64x64@2) [29 B]                                
Get:102 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe Icons 
(128x128) [157 kB]                              
Get:103 http://bg.archive.ubuntu.com/ubuntu resolute-updates/universe amd64 
c-n-f Metadata [4704 B]                         
Get:104 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse amd64 
Packages [11,9 kB]                            
Get:105 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse i386 
Packages [2412 B]                              
Get:106 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse 
Translation-en [3276 B]                             
Get:107 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse amd64 
Components [216 B]                            
Get:108 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse Icons 
(48x48) [29 B]                                
Get:109 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse Icons 
(64x64) [29 B]                                
Get:110 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse Icons 
(64x64@2) [29 B]                              
Get:111 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse Icons 
(128x128) [29 B]                              
Get:112 http://bg.archive.ubuntu.com/ubuntu resolute-updates/multiverse amd64 
c-n-f Metadata [256 B]                        
Get:113 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main amd64 
Components [212 B]                                
Get:114 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main Icons 
(48x48) [29 B]                                    
Get:115 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main Icons 
(64x64) [29 B]                                    
Get:116 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main Icons 
(64x64@2) [29 B]                                  
Get:117 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main Icons 
(128x128) [29 B]                                  
Get:118 http://bg.archive.ubuntu.com/ubuntu resolute-backports/main amd64 c-n-f 
Metadata [112 B]                            
Get:119 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted amd64 
Components [216 B]                          
Get:120 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted Icons 
(48x48) [29 B]                              
Get:121 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted Icons 
(64x64) [29 B]                              
Get:122 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted Icons 
(64x64@2) [29 B]                            
Get:123 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted Icons 
(128x128) [29 B]                            
Get:124 http://bg.archive.ubuntu.com/ubuntu resolute-backports/restricted amd64 
c-n-f Metadata [120 B]                      
Get:125 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe i386 
Packages [1156 B]                              
Get:126 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe amd64 
Packages [3136 B]                             
Get:127 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe 
Translation-en [7988 B]                             
Get:128 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe amd64 
Components [1056 B]                           
Get:129 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe Icons 
(48x48) [2879 B]                              
Get:130 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe Icons 
(64x64) [3645 B]                              
Get:131 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe Icons 
(64x64@2) [29 B]                              
Get:132 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe Icons 
(128x128) [7597 B]                            
Get:133 http://bg.archive.ubuntu.com/ubuntu resolute-backports/universe amd64 
c-n-f Metadata [116 B]                        
Get:134 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse amd64 
Components [216 B]                          
Get:135 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse Icons 
(48x48) [29 B]                              
Get:136 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse Icons 
(64x64) [29 B]                              
Get:137 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse Icons 
(64x64@2) [29 B]                            
Get:138 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse Icons 
(128x128) [29 B]                            
Get:139 http://bg.archive.ubuntu.com/ubuntu resolute-backports/multiverse amd64 
c-n-f Metadata [120 B]                      
Fetched 69,9 MB in 6s (11,5 MB/s)                                               
                                            

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

Calculating the changes

Calculating the changes

Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade.

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree... Done 
Reading state information... Done

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.29
ProcVersionSignature: Ubuntu 6.8.0-146.146.1-lowlatency 6.8.12
Uname: Linux 6.8.0-146-lowlatency x86_64
NonfreeKernelModules: zfs nvidia_modeset nvidia
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CrashReports: 640:1000:117:16289523:2026-09-30 02:36:29.303066274 
+0300:2026-09-30 02:36:20.922526049 
+0300:/var/crash/_usr_bin_xfdesktop.1000.crash
Date: Wed Oct  7 08:54:08 2026
InstallationDate: Installed on 2017-09-21 (3302 days ago)
InstallationMedia: Ubuntu-Studio 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to noble on 2026-10-07 (0 days ago)

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


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

** Attachment added: "/var/log/dist-upgrade/20261007-0851/apt.log"
   https://bugs.launchpad.net/bugs/2169799/+attachment/6006709/+files/apt.log

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2169799

Title:
  Ubuntu Studio fails to upgrade from 24.04.5 to 26.04.1

To manage notifications about this bug go to:
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