Let's try to answer the past questions here:
1) Only Orin devices are compatible with Jammy images for proper booting. Thor 
is only supported beginning with Noble images (and corresponding kernel). There 
are no plans to change that.
2) We are collaborating with NVIDIA to publish Jetson custom kernels, but this 
follows NVIDIA's release schedule, which differs from the Ubuntu one. 
Consequently, we are limiting our focus to LTS images. NVIDIA has plans to 
release a noble kernel compatible with both Thor and Orin, but that won't 
happen before mid 2026. In the meantime, we need a solution to temporarily 
block the release upgrade mechanism from Jammy to Noble. But indeed doing it in 
ubuntu-release-upgrader would be a better choice, thanks for the suggestion.
3) Similarly, we'll also need to temporarily block release upgrades from Noble, 
until we have a Resolute custom kernel.

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https://bugs.launchpad.net/bugs/2127100

Title:
  [SRU] Fix kernel cmdline for Thor systems, drop incorrect chmod, block
  jammy do-release-upgrade

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