I'm not certain which drop-down you talk about.
I noticed the combo-box for the destination of the boot loader, more on 
the bottom of the page, where I set, as written in my original bug
description :
...
  Installed with this layout:
   / to /dev/sda5 (just a free partion)
   grub to /dev/sda
   The installer run a few minutes, the I get two messages:
   first, something with ' can' t install grub to /target/ ...'
   Then " the installer crashed'  , and some apport reporting dialog 
opens, which redirects me to this web page.
...

Thus to /dev/sda , not to /dev/sda1 .

I guess that this was a fault, and that I should have chosen /dev/sda1 
instead. Maybe, but again, the issue (of the ticket)
is that the installer crashes, not that the system might be unusable.
I think it is ok when the user (me) does manual partition without
much experience with EFI and then gets a broken system. I took the risk 
(and did a backup).


Am 25.04.2016 um 16:57 schrieb Mathieu Trudel-Lapierre:
> 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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