Ubuntu updating bootloader
The problem can also occur alongside a BIOS or Grub update.This article shows you how to make the startup entries again.We are also aware of some cases where the UEFI boot entries from the Grub update, (ie regardless of the BIOS update), that could not be created correctly.We also know about such documented cases with both X9SCM-F and X9DR7-LN4F motherboards with Ubuntu Launchpad. If there are missing UEFI boot entries after the core update they can be restored as described below after restarting the system.If it does, edit the existing line instead of adding a duplicate one.Choose the Default OS: Change the GRUB_DEFAULT= line.In other words, to customize your GRUB2 settings, you’ll have to edit the /etc/default/grub file and then run the sudo update-grub command.RELATED: The /etc/default/grub file is short and should be easy to edit.
To set a higher timeout, use something like GRUB_HIDDEN_TIMEOUT=5 — GRUB will display an empty screen or splash screen for five seconds, during which you can press any key to view the menu.
The Ubuntu installer will create an UEFI boot entry in BIOS during the installation of Ubuntu 12.04 LTS Server on a server with a Supermicro X9SCM-F Motherboard.
When updating the BIOS of a Supermicro X9SCM-F motherboard (from BIOS Version 1.x to 2.x), these boot entries will be lost and Ubuntu will no longer boot afterwards.
Choose Whether GRUB is Hidden: With only one operating system installed, Ubuntu defaults GRUB to automatically boot to the default OS with the GRUB_HIDDEN_TIMEOUT=0 option.
This option specifies GRUB will be hidden and it will automatically boot to the default OS after 0 seconds –immediately, in other words.