This is fixed with 
grub-installer (1.128ubuntu11) cosmic; urgency=medium

  * grub-installer: actually also do not purge grub-gfxpayload-lists as it's
    yet another dependency of grub-pc.

In image 20180628.1

You can verify the version you are using by booting the image to a live session 
an running the following command from a terminal:
cat /cdrom/.disk/info

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https://bugs.launchpad.net/bugs/1779068

Title:
  installation of cosmic 20180627.1 fails on removal of grub-pc-bin

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