Grub

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Revision as of 19:08, 23 September 2023 by Brb (talk | contribs) (→‎Triple boot)
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Resources

Repair/update Grub2

Ubuntu: Boot Repair

https://help.ubuntu.com/community/Boot-Repair from a live USB

Not see Grub after re-install/upgrade Windows

Fix Grub Not Showing For Windows 10 Linux Dual Boot

Add a new entry to boot an ISO

Pop_OS! does not use Grub, but rather systemd-boot

How to install grub menu on pop os?

Configuration - /etc/default/grub

How to Configure the GRUB2 Boot Loader’s Settings

Configuration options:

  • Scripts in /etc/grub.d
  • Configuration file at /etc/default/grub

Incorporating changes:

  • grub2-mkconfig (or grub-mkconfig for Grub v1) reads configurations and generates a new configuration for /boot/grub2 (or /boot/grub)

Show the grub2 screen

To show the grub2 screen, run sudo nano /etc/default/grub and comment out the line GRUB_HIDDEN_TIMEOUT=0 and change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="". Remember to run 'sudo update-grub' after any change to grub.

Change theme

How To Change GRUB Theme In Linux

Set Screen Resolution

Set Screen Resolution using Kernel Boot Parameter on Linux. I try "vga=ask" and "vga=341" and both do not work.

How do I set the grub timeout and the grub default boot entry?

https://askubuntu.com/questions/148095/how-do-i-set-the-grub-timeout-and-the-grub-default-boot-entry

  1. gksudo gedit /etc/default/grub
  2. Change as you like. Save and closed the file.
    • You can change the default from 0 to any number
    • You can change the "hidden timeout" (no menu)
    • You can force the grub menu to show by commenting out the two GRUB_HIDDEN lines with a # at the beginning of the line
    • set the grub menu timeout (default is 10 seconds)
  3. sudo update-grub
  4. Reboot

Grub Customizer - GUI program

Add a splash image

Follow the instruction at https://help.ubuntu.com/community/Grub2/Displays. Note that Grub2 will search the image based on some priority and there are also some minor requirements on the images. To test

sudo apt-get install grub2-splashimages
sudo cp /usr/share/images/grub/Moraine_Lake_17092005.tga /boot/grub/
sudo update-grub

Boot into command line

http://www.linuxandubuntu.com/home/how-to-boot-into-linux-command-line

  1. Highlight the first item (default) and press 'e' in the GRUB menu
  2. Navigate to the line that starts with ‘linux’, change the runlevel to 3 (at the end of the line). Level 3 means multi-user, command-line only system
  3. Press Ctrl+x or F10 to boot into

To switch back to GUI, type sudo init 5. Level 5 is the default.

Dual boot

How to setup a Windows 10, Linux Mint 19.1 Dual Boot with Encrypted Partitions on a Dell XPS 15 9560

Triple boot

Where is grub installed

MBR and GPT

Run Live Linux on Ram Disk

Increase root partition in Live session

  • For Ubuntu/Mint, the "toram" option in boot can get about 3.9GB root partition. So I cannot test the "dd" command to back up a DVD disk since it requires more than 3.9GB space for the final iso file.
  • How to adjust the size of the root partition on live Arch Linux system?
  • How To Adjust The Size Of The Root Partition On Live Arch Linux. When you boot the Arch Linux livecd, press e or hit tab key to edit the kernel parameters. Go to the end of the line that says ".... linux=... initrd=...." something like that and append cow_spacesize=1G at the end to get 1GB size root partition or whatever space left from RAM. It seems that cow_spacesize is specific to Arch Linux and its derivatives.

Systemd

Legacy BIOS

Fedora 37 Looks To Deprecate Legacy BIOS Support

BIOS, CMOS, UEFI

BIOS, CMOS, UEFI - What's the difference? (video)

Bootable DOS USB Drive for BIOS update

How to Create a Bootable DOS USB Drive

Dell Optiplex