As I said I've prepared a fix and it's waiting for upload to Oracular.

In the meantime I've done some test builds here:
- https://launchpad.net/~ubuntu-uefi-team/+archive/ubuntu/build/+build/28929792
- https://launchpad.net/~ubuntu-uefi-team/+archive/ubuntu/build/+build/28929800

After these are built (will be a few hours), you can test these, they
are based on the 2.12-5ubuntu5 sources that I can no longer reproduce
the regression on.

1. Install the packages on an Ubuntu installation
2. Boot into GRUB, and verify the package version to be 2.12-5ubuntu5~ppa1 by 
running `set`
3. Run `set debug=peimage` to enable PE loader Debug messages
4. Try to chainload Windows using `chainloader PATH` then `boot`

The above sequence correctly boots multiple Windows versions for me (on the 
GRUB referenced above).
Please note that the test GRUB isn't the same as the one currently available 
from the Oracular archive or ISOs (but it will be by Oracular Beta).

If it somehow still doesn't boot with the test GRUB, please show the
debug messages produced from the above.

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https://bugs.launchpad.net/bugs/2078307

Title:
  Grub 2.12 in Oracular is unable to boot Windows using chainloader

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