Public bug reported:
### Problem Description
The upgrade process from Kubuntu 24.04 LTS to 26.04 LTS via the official
release upgrader tool is completely blocked due to an infinite dependency loop
involving Python packages. The package manager keeps crucial core libraries
back, while the release upgrader refuses to proceed until the system is fully
up to date.
### Steps to Reproduce
1. Log into a fresh or existing Kubuntu 24.04 LTS system.
2. Run standard update commands: `sudo apt update && sudo apt upgrade`
3. Notice that the following packages are kept back:
- `python3-gi`
- `python3-gi-cairo`
4. Try to manually force the installation via `sudo apt install python3-gi`.
This fails with the following unmet dependencies error:
`python3-gi : Depends: python3 (>= 3.13~) but 3.12.3-0ubuntu2.1 is to be
installed`
5. Attempt to proceed with the OS upgrade anyway using the development branch
flag: `sudo do-release-upgrade -d`
6. The process aborts immediately with the message:
`Please install all available updates for your release before upgrading.`
### Actual Behavior
The user falls into an unbreakable deadlock situation:
- The `python3-gi` package on the server repository demands Python 3.13 (which
is native to 26.04).
- The host system is locked to Python 3.12 (native to 24.04), causing APT to
flag the packages as "kept back".
- The `do-release-upgrade` tool enforces a strict pre-flight check that forbids
execution if any packages are kept back.
- Purging `python3-gi` to bypass the check is not a viable workaround as it
acts as a base dependency for foundational system packages including
`update-manager`, `software-properties-common`, `hplip`, and `apport`.
Attempting to remove it threatens to strip away critical desktop utilities.
### Expected Behavior
The `do-release-upgrade` tool should seamlessly recognize this cross-version
Python dependency bottleneck. It should bypass the strict pre-flight check for
these specific core infrastructure bindings, allowing the system to fetch the
new distribution state where Python 3.13 and the compatible libraries can be
unpacked simultaneously.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.28
ProcVersionSignature: Ubuntu 6.17.0-35.35~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Jun 20 18:17:28 2026
InstallationDate: Installed on 2026-03-09 (103 days ago)
InstallationMedia: Kubuntu 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210)
PackageArchitecture: all
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.update-manager.release-upgrades: 2026-06-20T17:25:56.020081
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade noble third-party-packages
wayland-session
** Description changed:
### Problem Description
The upgrade process from Kubuntu 24.04 LTS to 26.04 LTS via the official
release upgrader tool is completely blocked due to an infinite dependency loop
involving Python packages. The package manager keeps crucial core libraries
back, while the release upgrader refuses to proceed until the system is fully
up to date.
### Steps to Reproduce
1. Log into a fresh or existing Kubuntu 24.04 LTS system.
2. Run standard update commands: `sudo apt update && sudo apt upgrade`
3. Notice that the following packages are kept back:
- - `python3-gi`
- - `python3-gi-cairo`
+ - `python3-gi`
+ - `python3-gi-cairo`
4. Try to manually force the installation via `sudo apt install python3-gi`.
This fails with the following unmet dependencies error:
- `python3-gi : Depends: python3 (>= 3.13~) but 3.12.3-0ubuntu2.1 is to be
installed`
+ `python3-gi : Depends: python3 (>= 3.13~) but 3.12.3-0ubuntu2.1 is to be
installed`
5. Attempt to proceed with the OS upgrade anyway using the development branch
flag: `sudo do-release-upgrade -d`
6. The process aborts immediately with the message:
- `Please install all available updates for your release before upgrading.`
+ `Please install all available updates for your release before upgrading.`
### Actual Behavior
The user falls into an unbreakable deadlock situation:
- The `python3-gi` package on the server repository demands Python 3.13
(which is native to 26.04).
- The host system is locked to Python 3.12 (native to 24.04), causing APT to
flag the packages as "kept back".
- The `do-release-upgrade` tool enforces a strict pre-flight check that
forbids execution if any packages are kept back.
- Purging `python3-gi` to bypass the check is not a viable workaround as it
acts as a base dependency for foundational system packages including
`update-manager`, `software-properties-common`, `hplip`, and `apport`.
Attempting to remove it threatens to strip away critical desktop utilities.
### Expected Behavior
The `do-release-upgrade` tool should seamlessly recognize this cross-version
Python dependency bottleneck. It should bypass the strict pre-flight check for
these specific core infrastructure bindings, allowing the system to fetch the
new distribution state where Python 3.13 and the compatible libraries can be
unpacked simultaneously.
- Hãy thận trọng khi sử dụng mã.✅ Hướng dẫn thêm:Sau khi dán phần này, nếu
trang web có hỏi thêm về phân loại lỗi, bạn có thể chọn tag liên quan đến
ubuntu-release-upgrader hoặc apt.Bạn đã hoàn tất gửi báo cáo chưa? Khi quay trở
lại với máy tính, bạn có cần tôi hướng dẫn cách tạo USB boot Kubuntu 26.04 để
vượt qua lỗi này và trải nghiệm hệ điều hành mới luôn không?
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.28
ProcVersionSignature: Ubuntu 6.17.0-35.35~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Jun 20 18:17:28 2026
InstallationDate: Installed on 2026-03-09 (103 days ago)
InstallationMedia: Kubuntu 24.04.4 LTS "Noble Numbat" - Release amd64
(20260210)
PackageArchitecture: all
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.update-manager.release-upgrades:
2026-06-20T17:25:56.020081
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https://bugs.launchpad.net/bugs/2157695
Title:
Upgrade from Kubuntu 24.04 LTS to 26.04 LTS blocked by infinite
dependency loop (python3-gi kept back)
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