Right. I think here we're catching a case we can't do much about -- your
system boots fine without the boot flag set on the ESP (/dev/sda1); and
we don't automatically change things on the ESP so as not to break
things.

However, grub depends on a few hints to find out where the ESP is, namely that 
the passed device contains an EFI directory, and a vendor directory below it, 
hence the message you get:
Apr 16 17:49:31 ubuntu ubiquity: grub-install: error: cannot find EFI directory.

I suppose the best to do here is to validate that manual partitioning
allows setting grub's destination to /dev/sda1 too; I suspect maybe
ubiquity doesn't have that logic.

Did you notice that option in the drop-down when you did the install?

** Package changed: grub-installer (Ubuntu) => ubiquity (Ubuntu)

** Changed in: ubiquity (Ubuntu)
       Status: Invalid => Incomplete

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https://bugs.launchpad.net/bugs/1571230

Title:
  Installer crashes with UEFI, can't install grub to /target/

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