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Ubuntu 20.04 LTS switching from 5.4 to the 5.15 kernel. We need more "long term" distros switching away from absolutely ANCIENT kernels. Looking at you, RedHat.
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At least Ubuntu uses the LTS kernel versions, now. AFAIK they at least once used a non lts kernel. Not to mention *cough* Android *cough*.
Screenshot of the Linux Kernel Website incl. all long-term kernel versions.
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Android uses the LTS kernels and is why they're supported for 6 years since most vendors don't want to move to a different LTS but want to support devices for 5 years. There's a 5.15 LTS port for the Pixel 6 from the original 5.10 LTS but I'm unsure if they're going to ship it.
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I described what Android is doing at twitter.com/DanielMicay/st. Most non-Pixel phones aren't good at shipping AOSP updates in general. It's required to support GKIs/GSIs but they don't require vendors including Google Play to ship standard AOSP builds of those via Play Store (yet).
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Replying to @DanielMicay and @marcan42
Pixel 6 used 5.10 LTS since it was latest at the time but they've published experimental 5.15 LTS support. Kernel itself is a GKI (cross-device) and out-of-tree modules are built against the stable ABI. Latest Android 12 5.10 GKI is android.googlesource.com/kernel/common/ based on 5.10.117.