It looks like this was fixed in cosmic but referenced a different bug number.
grub-installer (1.128ubuntu9) cosmic; urgency=medium
* grub-installer: install grub-pc for EFI setups and make sure we're
not purging it earlier in case it got installed. It's needed to make sure
the right maintainer scripts are run and the ESP populated. (LP: #1775743)
-- Łukasz 'sil2100' Zemczak <lukasz.zemc...@ubuntu.com> Tue, 19 Jun
2018 10:25:14 +0200
** Changed in: grub-installer (Ubuntu)
Status: New => Fix Released
** Changed in: grub-installer (Ubuntu Bionic)
Status: New => Fix Committed
** Tags added: verification-needed verification-needed-bionic
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https://bugs.launchpad.net/bugs/1778848
Title:
Support for grub upgrades with bios+uefi bootloader targets
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