I think when we changed to using GRUB_TIMEOUT_STYLE=hidden in
https://launchpad.net/ubuntu/+source/grub2/2.02-2ubuntu8.2
instead of GRUB_HIDDEN_TIMEOUT, we missed updating GRUB_TIMEOUT=0. In GRUB_TIMEOUT_STYLE=hidden, GRUB_TIMEOUT is what is used.
I think when we changed to using GRUB_TIMEOUT_ STYLE=hidden in
https:/ /launchpad. net/ubuntu/ +source/ grub2/2. 02-2ubuntu8. 2
instead of GRUB_HIDDEN_ TIMEOUT, we missed updating GRUB_TIMEOUT=0. In GRUB_TIMEOUT_ STYLE=hidden, GRUB_TIMEOUT is what is used.