[Ubuntu-ma] extra grub entries

[kosaidpo]

salam guys when i wanted to remove my old kernel
i did

cd /boot
rm -rf the_kernel_version then updated grub


and now the problem  is i have an extra entries in my grub menu
the memory test lines iused to have only 2 but now as you can see 4 ,
can anyone tell me how to remove it
kosaidpo ,best regards
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