Ubuntu updating bootloader
Your changes will become part of the file and will be used each time you boot your computer.These aren’t all of GRUB’s settings, but they are some of the most commonly changed.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.There’s also an os-prober script that checks the system’s internal hard drives for other installed operating systems — Windows, other Linux distributions, Mac OS X, and so on — and automatically adds them to GRUB2’s menu.
If any of the options below doesn’t already appear in the file, add it on a new line.You can change its settings to select a default operating system, set a background image, and choose how long GRUB counts down before automatically booting the default OS.We configured GRUB2 on Ubuntu 14.04 here, but the process should be similar for other Linux distributions. It’s automatically created by running the update-grub command as root — in other words, by running sudo update-grub on Ubuntu.You can still access the menu by holding Shift as your computer boots.
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 following example illustrates a case where after the Grub update there are missing UEFI boot images: [email protected]:~$ sudo efibootmgr -v Boot Current: 0001 Timeout: 10 seconds Boot Order: 0001,0000,0002,0003,0005 Boot0000* ubuntu HD(1,800,f3800,caff37a0-8078-4b24-956e-79eb5e33631f)File(\EFI\ubuntu\grubx64.efi) Boot0001* ubuntu2 HD(1,800,f3800,957eb480-5f2f-409e-95b8-62c38a3305c0)File(\EFI\ubuntu2\grubx64.efi) [email protected]:~$ sudo apt-get update; apt-get upgrade [...] Reading state information...