Automotive Grade Linux Offers Three Active Release Series in 2026, Each With Different Support Windows

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As of August 2026, Automotive Grade Linux maintains three concurrent release series built on different Yocto Project baselines: Vibrant Vimba on Wrynose 6.0.x, Ultimate Unagi on Scarthgap 5.0.x, and the legacy Quirky Quillback on the now end-of-life Kirkstone 4.0.x. Vibrant Vimba is listed as the latest stable release and carries the longest upstream support horizon, running to April 2030, while Ultimate Unagi is supported until April 2028. A practical challenge exists because the project's announcements, product page, and release-notes wiki do not consistently point engineers to the same baseline, potentially leading teams to fetch a branch with a shorter support window. The choice of release series carries significant consequences for vehicle programmes, since automotive software lifecycles can outlast the upstream support periods of both active series. Engineers are advised to consult the release-notes wiki directly rather than relying on press releases to determine the appropriate branch for their project's longevity requirements.

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