GRUB_TERMINAL=serial in /etc/default/grub seems to work fine for me on
Oracular's GRUB 2.12 build.
** Changed in: grub2 (Ubuntu)
Status: Triaged => Fix Released
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** Changed in: grub2 (Ubuntu)
Status: Confirmed => Triaged
** Changed in: grub2 (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1763151
Title:
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1763151
Title: