Ubuntu updating bootloader

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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.

When you run the update-grub command, GRUB automatically combines the settings from the /etc/default/grub file, the scripts from the /etc/grub.d/ directory, and everything else, creating a /boot/grub/file that’s read at boot.

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Ubuntu and most other Linux distributions now use the GRUB2 boot loader.

You can add a line like GRUB_BACKGROUND=”/home/user/Pictures/background.png” to specify an image file GRUB will use. GRUB supports JPG/JPEG images, but these are limited to 256 colors — so you probably won’t want to use a JPG image.

Instead, you’ll probably want to use a PNG image that can have any number of colors. To have your changes take effect, simply save the text file — File Save in Gedit or Ctrl O and then Enter to save the file in Nano — and then run the sudo update-grub command.

You can still access the menu by holding Shift as your computer boots.

Control GRUB’s Menu Timeout: If GRUB isn’t automatically hidden, you’ll see the menu each time your computer boots.

The problem can also occur alongside a BIOS or Grub update.

This article shows you how to make the startup entries again.

If it does, edit the existing line instead of adding a duplicate one.

Choose the Default OS: Change the GRUB_DEFAULT= line.

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