Tested on bionic:
mkfs.btrfs /dev/vda2
mount /dev/vda2 /mnt
cp -a /boot/* /mnt/
umount /mnt
mount /dev/vda2 /mnt
grub-install vda
update-grub
reboot
- Boot to the grub prompt and hit 'c'
grub> save_env timeout_style
error: sparse file not allowed
grub>
grub does not support writes to btrfs; therefore Ubuntu does not have
recordfail handling; therefore we cannot default to a timeout of zero on
UEFI systems when grub is installed to btrfs.
You are welcome to adjust the timeouts in /etc/default/grub, but the
grub package's behavior here is deliberate.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => 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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