Linux/grub: Difference between revisions
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==related commands== | ==related commands== | ||
* {{l/same|grub-install}} | * {{l/same|grub-install}} | ||
** note that the target must be a ''device'' (e.g. /dev/sdd), | ** note that the target must be a ''device'' (e.g. /dev/sdd), not a ''partition'' or ''filesystem'' (e.g. /dev/sdd1). | ||
* {{l/same|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. | |||
* {{l/same|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]]'' | |||
* <code>ls (hd{{arg|drive}},{{arg|partition}})</code> | |||
** Example: <code>ls (hd0,2)</code> | |||
*** Returns: (hd0,2): Filesystem is ext2. | |||
** Example: <code>ls (hd0,2)/boot/grub</code> | |||
*** Returns: ''(horizontal list of files)'' | |||
==Notes== | |||
* https://askubuntu.com/questions/41930/kernel-panic-not-syncing-vfs-unable-to-mount-root-fs-on-unknown-block0-0/48516#48516 - this actually worked when the Repair Disk did not | |||
* http://community.linuxmint.com/tutorial/view/245 | |||
* http://askubuntu.com/questions/420778/i-need-step-by-step-guidence-to-recover-grub | |||
* https://askubuntu.com/questions/142300/how-to-fix-error-unknown-filesystem-grub-rescue | |||
* https://ubuntuforums.org/showthread.php?t=1706090 "Grub error unknown filesystem" | |||
* https://askubuntu.com/questions/5298/grub-help-and-reinstalling-ubuntu | |||
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 | |||
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 | |||
* 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)
- Example:
Notes
- https://askubuntu.com/questions/41930/kernel-panic-not-syncing-vfs-unable-to-mount-root-fs-on-unknown-block0-0/48516#48516 - this actually worked when the Repair Disk did not
- http://community.linuxmint.com/tutorial/view/245
- http://askubuntu.com/questions/420778/i-need-step-by-step-guidence-to-recover-grub
- https://askubuntu.com/questions/142300/how-to-fix-error-unknown-filesystem-grub-rescue
- https://ubuntuforums.org/showthread.php?t=1706090 "Grub error unknown filesystem"
- https://askubuntu.com/questions/5298/grub-help-and-reinstalling-ubuntu
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
Other links that may be useful:
