Hi Ubfan, We don't know if your issue is the current bug (Input/Output error), or Bug #1091477 ("Read-Only" error), or else, because you didn't mention the output of "grub-install --efi-directory=/boot/efi --target=x86_64-efi".
Hi Ubfan, =/boot/ efi --target= x86_64- efi".
We don't know if your issue is the current bug (Input/Output error), or Bug #1091477 ("Read-Only" error), or else, because you didn't mention the output of "grub-install --efi-directory