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sudo efibootmgr
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sudo efibootmgr
What about doing some simple steps:
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ls -l /boot/grub/grub.*
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sed -nr '/menuentry|vmlinuz/{s/--.*//;p}' /boot/grub/grub.cfg
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sudo update-grub
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ls -l /boot/grub/grub.*
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sed -nr '/menuentry|vmlinuz/{s/--.*//;p}' /boot/grub/grub.cfg