My experience with an EOL kernel and a Couple of take aways

[stargazer]

@cscs

If that is true then it is a bug.

When it occurred (never know for certain if it is a bug or a feature ), I searched and found this entry marked as the Solution:

Mhwd-kernel -li shows one kernel,5.10 but on grub it shows 3 5.10 with 5.8 and 5.7

There are remnants of old kernels in /boot - remove them manually: $ sudo rm /boot/vmlinuz-5.[78]-x86_64 /boot/initramfs-5.[78]-x86_64.img $ sudo update-grub