A Kernel Potato: Ubuntu, one of the most popular Linux distributions available, is a free and open-source operating system based on Debian, utilized by both end users and enterprise ventures. Built with stability and reliability in mind, significant changes could be on the horizon.
Canonical recently announced a notable policy change regarding Linux adoption in the Ubuntu operating system. The Canonical Kernel Team (CKT), responsible for managing kernel-related issues for any Ubuntu release, will soon begin integrating the latest version of the Linux kernel, even if there is no final stable build released yet.
As the British company explains, Ubuntu follows a stringent, time-based release schedule. Release dates are set six months in advance, with delays permissible only under “extreme” circumstances. The most recent long-term support version of Ubuntu, 24.04 “Noble Numbat,” was released in April 2024.
Meanwhile, developers working on the Linux kernel follow a “loosely time-based release process,” with a new major kernel release occurring every two to three months. The actual release date for each new version is described as “fluid,” allowing project leader Linus Torvalds to adjust the upstream development process if a significant bug is discovered.
A stable release cadence is crucial for maintaining a reliable operating system, explains Canonical’s Brett Grandbois. Ubuntu isn’t merely an experimental Linux OS for hobbyists; it is officially offered in multiple editions, including desktop environments, servers, cloud data centers, and IoT devices.
Traditionally, Ubuntu releases have only included the most recent stable version of the Linux kernel, with a kernel freeze milestone set two months before each new OS upgrade. This approach has proven unpopular as many users desire access to the latest features and hardware support that the most recent Linux versions offer.
“To provide users with the absolute latest in features and hardware support, Ubuntu will now ship the latest available version of the upstream Linux kernel at the specified Ubuntu release freeze date,” Canonical stated, even if that kernel is still in Release Candidate (RC) status with some bugs remaining to be resolved before the final release.
This new “aggressive kernel version commitment policy” carries risks, as RC releases are not considered final by Torvalds and his team for a reason. However, Canonical will need to manage these risks by providing official support for the specific Linux release included in the new Ubuntu version. Updating the kernel after the release is not feasible either, as the Linux edition shipped with Ubuntu is a highly optimized kernel with specific features, patches, and hardware support provided by Canonical and its OEM partners.
