Ubuntu 24.04.1 LTS Upgrades Back Online After Temporary Suspension

Ubuntu 24.04.1 LTS upgrades are now available again following a temporary suspension. The Ubuntu development team has resolved the underlying problems, enabling users of Ubuntu 22.04 LTS to seamlessly upgrade to the latest version.

Table of Contents

• Resolution Details
• Recommended Actions for Affected Users

Root Causes of the Upgrade Halt

The temporary halt to upgrades stemmed from two key issues:

1. Missing Kernel Header Dependencies: The updated ubuntu-release-upgrader (version 1:24.04.22) introduced a new algorithm aimed at performance improvements. However, this algorithm unexpectedly failed to reverse package removal requests in certain scenarios, leading to broken packages and APT errors. This occurred specifically when a kernel header for the currently running kernel was installed during the upgrade process.

2. Previous Kernel Header Removal: Earlier versions of ubuntu-release-upgrader inadvertently removed kernel headers. While this didn't directly affect 24.04 LTS kernels or package updates, it could cause issues with DKMS modules if an older kernel remained in use.

Resolution Details

The Ubuntu team implemented the following fixes:

• Missing Kernel Header Dependencies: The APT 2.4.13 update for 22.04 LTS addresses this problem. A fallback to the previous algorithm was added to ubuntu-release-upgrader 1:24.04.23 for upgrades from interim releases.
• Previous Kernel Header Removal: The ubuntu-release-upgrader 1:24.04.23 release also includes a fix for the unintended removal of kernel headers during upgrades from interim releases.

Furthermore, the team has strengthened its automated upgrade testing procedures to prevent similar incidents in the future.

Recommended Actions for Affected Users

Users encountering issues related to missing kernel header dependencies should execute the following command:

sudo apt install --fix-broken

This command will remove outdated kernel headers, restoring the proper functionality of APT.

Further Reading:

• Troubleshooting Busybox Initramfs Errors in Ubuntu
• Recovering a Broken Ubuntu System Without Reinstallation

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