If you are booting via UEFI and your /boot is on btrfs then grub has
detected that /boot/grub/env is not writable from within grub and
therefore the boot menu is shown with a delay. As discussed in bug
#1814403, this is by design.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1815002
Title:
quick-boot-lvm.patch caused regression - menu always appear if root is
on Btrfs
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