Just to leave relevant information for ppl. reaching this page from
google (like me ;) )

I had similar issue after running normal dist-upgrade on 20.04 which was 
working fine since months, which is an "old" upgraded system (originally 
started as Ubuntu 06 ;) ), dual-boot with Windows 10 which I had recently (b/o 
this year) moved to a NVMe SSD (which required me to switch to EFI boot).
Now, I somehow followed guidelines how to do that, but most were not fully 
working for me and I had to re-install Windows 10, and I somehow managed to 
miss a vital part:
The '/boot/efi' entry in fstab !

After adding this entry, doing 'sudo mount -a' and re-running dist-
upgrade everything worked fine.

The fstab entry should look like:
UUID=5A8E-000B  /boot/efi  vfat   umask=0077  0    1

Replace the UUID by what's returned by blkid command on EFI partition.

Hope this info saves someone ;)

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  grub-install: error: cannot find EFI directory.

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