Public bug reported:
$sudo do-release-upgrade -d
Get:1 Upgrade tool signature [833 B]
Get:2 Upgrade tool [948 kB]
Fetched 949 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
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Hit http://nl.archive.ubuntu.com/ubuntu noble InRelease
...
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://nl.archive.ubuntu.com/ubuntu resolute InRelease [124 kB]
...
Fetched 189 MB in 6s (2,208 kB/s)
Checking package manager
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating the changes
Calculating the changes
Could not calculate 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 1:24.04.28
ProcVersionSignature: Ubuntu 6.8.0-107.107-generic 6.8.12
Uname: Linux 6.8.0-107-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu
Date: Fri Apr 3 00:03:06 2026
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to noble on 2026-04-02 (0 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/2147155
Title:
Upgrade from 24.04.4 to 26.04 failed: An unresolvable problem occurred
while calculating the upgrade.
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