Selected Problems and Bugs External Drive Installs and ''grub-pc'' Updates Launchpad Bug 496435 Installs of Ubuntu on external drives can cause problems as grub-install uses device names (e.g. If the module fails to load, try the full path: insmod (hdX,Y)/boot/grub/normal.mod 4. For example: ls (hd0,1)/, ls (hd0,2)/, ls (hd0,2)/initramfs/, etc.. –DocSalvager Sep 21 at 5:48 add a comment| Not the answer you're looking for? Without it, GRUB might refuse to install or might be unreliable.
In addition to its troubleshooting benefits, pre-boot editing of the GRUB 2 menu also allows users to add or remove kernel options, change operating modes, and accomplish other tasks such as nothing new here. GRUB notation This section is intended to help you get familiar with GRUB, without touching anything. is the temporary file system that makes system preparations - adapts generic kernel image to specific hardware - before the real root is loaded.
Ubuntu Grub Rescue Commands
A complete description of the GRUB configuration file format is beyond this article's scope, but I do cover the configuration basics, which can help you correct simple errors (such as an Type ls to list all partitions that GRUB sees: grub> ls (hd0) (hd0,msdos2) (hd0,msdos1)What's all this msdos stuff? See the bug report for more details.
Consequently, GRUB will suffer. How about donating some dinero to Dedoimedo? If there's a problem with your Xorg graphical server configuration or graphics drivers and that's causing your Ubuntu system to boot to a black screen or preventing the graphical desktop from Grub Unknown Filesystem Here's a link to the page created by boot-repair.
Now let's snoop. Grub2 Commands Let's see some more examples. This issue is extremely annoying if your server is in a remote datacenter since the origin of the problem cannot be spotted easily and repairing the system may be hard. great post to read An example script that can be used for this is available at this webpage (in German).
Puppy Linux 5.2.8 (Lucid) based on Ubuntu 10.04 (Lucid Lynx) GRUB 2 boot loader GRUB 2 puts a number of *.mod files (kernel modules) in /boot/grub. Grub Command Line Boot Usb deshackDecember 28, 2015 at 7:40 am Reply Hi Joao, other than what explained here, are you sure Windows does not cause problems? Evaluate IBM products by downloading a product trial. After running efibootmgr, when o get into the BIOS, the only boot option is "Windows boot manager".
Busybox or Initramfs: GRUB 2 began the boot process but there was a problem passing control to the operating system.
You may have heard about another Linux bootloader called LILO (stands for LInux LOader).
He's as at home using the Linux terminal as he is digging into the Windows registry.
Now that we have established this, we can move on to the more technical parts of grubbing.
I would have wished it to be the other way around.
Once successfully booted, the changes can be made permanent by editing the appropriate file, saving the file, and running update-grub as 'root'.
network: Enable networking, which is disabled by default in recovery mode.
The instructions are written for GRUB 1.99, which is the version of GRUB 2 which is included on Ubuntu 11.04, Natty Narwhal, and later.
I really appreciate your help.
No error after putting those lines in the terminal.
GRUB 2 Errors GRUB 2 does not report error numbers. https://ubuntuforums.org/showthread.php?t=2074309 We know from running the ls command that there is a Linux root filesystem on (hd0,1), and you can keep searching until you verify where /boot/grub is. Ubuntu Grub Rescue Commands Code: ln -s /boot /mnt/sda6/boot Also could you explain what this symbolic link will do? Grub Command Line Boot Windows But wouldn't bring my Ubuntu desktop back up.
From: Gerald F Kenne Reply I rebooted, and grub rescue mode, grub rescue is displayed, however I'm not able to
Extended Fix: The following commands should set the root and prefix paths and load the kernel and initrd image. grub>: This is the screen mode you see when GRUB has found everything except the configurationn file. failsafeX: Boots your computer in a failsafe graphic mode. grub> Terminal Display: The GRUB 2 header/version information and a grub> prompt. Grub Command Line Boot Ubuntu
ESC - Discard all changes and return to the main menu. sudo update-grub Reinstallation of Grub on the device: sudo grub-install /dev/sdX This should be it for the rescue part and your system should be good and running. title Windows rootnoverify (hd0,0) chainloader (hd0,0)+1 rootnoverify (hd0,0) means that openSUSE cannot understand Windows operating system, i.e. TAB completion is available, which is useful in entering kernel and initrd entries.
May I suggest you to try the Ubuntu forum? Ubuntu Grub Repair As I have important data in Ubuntu partition I don't want to experiment my own loosing data. EDIT I've gotten a little bit further.
If the initrd symlink does not exist in /, use the full path to the initrd image in /boot If successful, after ENTER there will be a slight delay and no
If the issue is not resolved, try asking on https://ubuntuforums.org since I cannot help further.. That will also show top-level directories. grub rescue> set root=(hd0,2)/boot grub rescue> insmod linux grub rescue> linux (hd0,2)/boot/vmlinuz-2.6.32-33-generic grub rescue> initrd (hd0,2)/boot/initrd.img-2.6.32-33-generic grub rescue> boot Set root to use the /boot directory on partition (hd0,2). Grub Load Kernel Only problem with Ubuntu loading.
finally almost was going to reformat that saved me as always good contributions last look and look until I found you because all pointed to / boot / grub that was These commands are sufficient to investigate the contents of the drives, set prefix (path to the grub folder) and root (partition), load modules and boot. Your display name must be unique in the developerWorks community and should not be your email address for privacy reasons. Once you have decided on the root, you need to write the information to the MBR: setup (hd0) Finally, quit the GRUB prompt: quit As a sequence, the commands that you
Here's the set of commands that you need to execute (taken from the Manual): cd /usr/lib/grub/i386-pc dd if=stage1 of=/dev/fd0 bs=512 count=1 dd if=stage2 of=/dev/fd0 bs=512 seek=1 Just a short explanation: if While this can cause problems on a server, for most users it is a benefit which will prevent constant rebooting during unmonitored operations. Isn't AES-NI useless because now the key length need to be longer? If the path to the grub folder (normally /boot/grub) is not correct, an unknown command or file not found message is likely.
You can identify it by the grub> prompt. You remember that I have told we could have booted Ubuntu in an alternative way? How? I had been running a Linux session for a few days now, and only today restarted the machine, so I don't think it is anything from a Windows update that broke
In such cases, you might need to perform an emergency boot and then use the efibootmgr utility to restore GRUB as the default boot loader.In addition to the low-level BIOS or That's definitely not working in this instance. –cmhobbs May 2 '11 at 20:57 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using insmod linux * linux /vmlinuz root=/dev/sdXY ro (if this doesn't work try this) linux /boot/vmlinuz-3.2.0-14-generic root=/dev/sda1 ro (optional) initrd /initrd.img (Selects the initrd image.) boot After Booting the system. A Linux kernel and initrd.img must be located and loaded.
These variable identify, respectively, the directory in which grub.cfg lives and the partition on which it resides:grub> set prefix=(hd0,gpt5)/grub grub> set root=(hd0,gpt5)From here, you can load the normal module and launch Boot0009* UEFI: Network Card PciRoot(0x0)/Pci(0x1c,0x3)/Pci(0x0,0x0)/MAC(54bef7832b80,0)/IPv4(0.0.0.0:00.0.0.0:0,0,0)..BO Boot000A* UEFI: Network Card PciRoot(0x0)/Pci(0x1c,0x3)/Pci(0x0,0x0)/MAC(54bef7832b80,0)/IPv6([::]:[::]:,0,0)..BO Boot000B* UEFI: Network Card PciRoot(0x0)/Pci(0x1c,0x3)/Pci(0x0,0x0)/MAC(54bef7832b80,0)/IPv6([::]:[::]:,0,0)..BO Boot000C* UEFI: TOSHIBA MQ01ABD100 PciRoot(0x0)/Pci(0x1f,0x2)/Sata(4,65535,0)/HD(7,GPT,d86c58dc-28f3-43b8-9194-a6f28779580a,0x6f222000,0x32000)..BO Boot000E* kali HD(2,GPT,b4f4942a-0b9d-11e3-a0ba-a69b9f1ac104,0x200800,0x32000)/File(\EFI\kali\grubx64.efi) Boot000F* UEFI: TOSHIBA MQ01ABD100 PciRoot(0x0)/Pci(0x1f,0x2)/Sata(4,65535,0)/HD(16,GPT,ad549dce-ecf5-4277-924f-1724e3bfcd1d,0x6f306000,0x32000)..BO Boot0010* UEFI: USB You might need to peek inside other partitions before finding your Linux /boot partition. GRUB can also boot Windows for you, so you'll still be able to boot into Windows after you install GRUB.
Normally, this is the case, and for the sake of simplicity, you will want this option during your installations. Edits made to the menu in this manner are non-persistent. share|improve this answer edited Mar 9 '15 at 5:04 c1one 31 answered Nov 18 '14 at 17:15 Gibado 37134 6 I'm glad you guys posted before this was closed –smac89 However, this also means that if you install an inconsiderate OS later on (like Windows) or try to repair the MBR for some reason (by running fdisk /MBR from DOS prompt),
Update grub, reboot. +Solace @DeviantArt | Awesome Guide | Beginners Team Member Canadian Forces 2007-present Adv Reply October 22nd, 2012 #10 NHerby View Profile View Forum Posts Private Message 5 You can use an Ubuntu installation disc or USB drive to do this. initrd /boot/initrd.img-... Once installed, I restarted the computer in order to apply and test the update.