Verification done on xenial:
Preparing to unpack .../grub-efi-amd64-signed_1.66.11+2.02~beta2-36ubuntu3.11_amd64.deb ... Unpacking grub-efi-amd64-signed (1.66.11+2.02~beta2-36ubuntu3.11) over (1.66.9+2.02~beta2-36ubuntu3.9) ... Preparing to unpack .../grub-efi-amd64_2.02~beta2-36ubuntu3.11_amd64.deb ... Unpacking grub-efi-amd64 (2.02~beta2-36ubuntu3.11) over (2.02~beta2-36ubuntu3.9) ... Preparing to unpack .../grub2-common_2.02~beta2-36ubuntu3.11_amd64.deb ... Unpacking grub2-common (2.02~beta2-36ubuntu3.11) over (2.02~beta2-36ubuntu3.9) ... Preparing to unpack .../grub-efi-amd64-bin_2.02~beta2-36ubuntu3.11_amd64.deb ... Unpacking grub-efi-amd64-bin (2.02~beta2-36ubuntu3.11) over (2.02~beta2-36ubuntu3.9) ... Preparing to unpack .../grub-common_2.02~beta2-36ubuntu3.11_amd64.deb ... Unpacking grub-common (2.02~beta2-36ubuntu3.11) over (2.02~beta2-36ubuntu3.9) ...
I've verified that the fbx64.efi file is indeed no longer installed in /boot/efi/EFI/ubuntu.
Verification done on xenial:
Preparing to unpack .../grub- efi-amd64- signed_ 1.66.11+ 2.02~beta2- 36ubuntu3. 11_amd64. deb ... amd64-signed (1.66.11+ 2.02~beta2- 36ubuntu3. 11) over (1.66.9+ 2.02~beta2- 36ubuntu3. 9) ... efi-amd64_ 2.02~beta2- 36ubuntu3. 11_amd64. deb ... 36ubuntu3. 11) over (2.02~beta2- 36ubuntu3. 9) ... common_ 2.02~beta2- 36ubuntu3. 11_amd64. deb ... 36ubuntu3. 11) over (2.02~beta2- 36ubuntu3. 9) ... efi-amd64- bin_2.02~ beta2-36ubuntu3 .11_amd64. deb ... 36ubuntu3. 11) over (2.02~beta2- 36ubuntu3. 9) ... common_ 2.02~beta2- 36ubuntu3. 11_amd64. deb ... 36ubuntu3. 11) over (2.02~beta2- 36ubuntu3. 9) ...
Unpacking grub-efi-
Preparing to unpack .../grub-
Unpacking grub-efi-amd64 (2.02~beta2-
Preparing to unpack .../grub2-
Unpacking grub2-common (2.02~beta2-
Preparing to unpack .../grub-
Unpacking grub-efi-amd64-bin (2.02~beta2-
Preparing to unpack .../grub-
Unpacking grub-common (2.02~beta2-
I've verified that the fbx64.efi file is indeed no longer installed in /boot/efi/ EFI/ubuntu.