Difference between revisions of "Linux/grub"

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(Notes)
(Notes)
 
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Overall, though, this seems to be the magic tool for fixing broken grub booting: https://help.ubuntu.com/community/Boot-Repair
 
Overall, though, this seems to be the magic tool for fixing broken grub booting: https://help.ubuntu.com/community/Boot-Repair
 
* https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows - looks like it might discuss the manual steps Boot Repair does
 
* https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows - looks like it might discuss the manual steps Boot Repair does
 +
 +
Other links that may be useful:
 +
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/installation_guide/s2-grub-whatis-booting-uefi
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* https://www.eightforums.com/threads/uefi-doesnt-recognise-my-bootable-usb-device.16780/

Latest revision as of 20:40, 11 August 2019

related commands

  • grub-install
    • note that the target must be a device (e.g. /dev/sdd), not a partition or filesystem (e.g. /dev/sdd1).
  • grub-mkconfig creates a new grub.cfg based on what disks and boot options it finds. Run as root and redirect output to the desired file.
  • update-grub updates the grub menu
    • bootable drives do not need to be mounted in order to be included

Commmands

rescue mode

these commands are still available in rescue mode; examples are from a system with one hard drive on /dev/hda, 2nd partition is ext4

  • ls (hd<drive>,<partition>)
    • Example: ls (hd0,2)
      • Returns: (hd0,2): Filesystem is ext2.
    • Example: ls (hd0,2)/boot/grub
      • Returns: (horizontal list of files)

Notes

Overall, though, this seems to be the magic tool for fixing broken grub booting: https://help.ubuntu.com/community/Boot-Repair

Other links that may be useful: