Shouldn't sudo grub-install be sudo grub-install /dev/sd(x) where (x) is the identifier of your boot disk? Usually /dev/sda but not always.
UEFI Simplified, a quicker version
https://www.kubuntuforums.net/showth...l=1#post379977
(Now, with UEFI, if you write
grub-install /dev/sdx ,
the "/dev/sdx" has no meaning and will be ignored by GRUB.)
Your ESP--the ESP being used by the OS you are now booted into--will be mounted at /boot/efi, even if that ESP is on some other disk or even some wild partition somewhere. grub-install will find it (simply by using /boot/efi).
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