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I have different versions of these files in my EFI system partition, why is it so? I am running Ubuntu, and I have never updated my kernel or did things like that. How could these files appear then?

Most important question. Does this mean that I have installed a new kernel?

  • How do you know that you haven't? – user1686 Mar 29 at 20:10
  • I do not know how to do it. All I could do is hit okay when Ubuntu updates would appear. But could they install a new kernel? – Artem Hevorhian Mar 29 at 20:12
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Ubuntu will offer you new kernel versions for update in different contexts:

  • New minor releases of the current kernel, if there are security vulnerabilities patched or new features (e.g. a new ABI version)
  • If you have activated HWE kernels, then new major kernel versions as they become available (typically from newer Ubuntu releases)

In addition to that, Ubuntu (as most distros) will keep at least one older version of the kernel around, after a new one is installed: If the new kernel makes problems, you can easily revert to the tested version.

With apt autoremove you can clean up all your no longer needed kernel images.

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