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• How can I start Busybox at boot time, from GRUB, or even before GRUB?

  - by Andrei

  Most Busybox questions are related to the fact that users are dropped to a Busybox shell due to some unknown issues at boot time. This must make Busybox one of the most hated pieces of software. My problem is the opposite. I want to deliberately start Busybox at boot time either from GRUB, or even before GRUB. Is this possible? How can I do it? The purpose is to execute some commands before the boot sequence is reinitiated. So basically I want to execute some commands to make some hardware available to the bootloader.

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• grub recover command line

  - by Rakesh Mohan Hallen

  Recently the service provider link suddenly broke,while I was updating. Then suddenly while I was trying to boot, i could not. The message on my screen was grub recover missing, and I had no option but the grub recover command line. I really did not know what to do. So I installed an earlier version of ubuntu 10.04. It started to boot normally. Now my system is back to 12.04 the version i was working with. How does one handle problems like this?

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• Unable to Install GRUB in /dev/sda on raid drives

  - by Henry

  I'm trying to install 12.04LTS on a server but keep running into the unable to install grub error like so "Unable to Install GRUB in /dev/sda". The drives are in raid1 and I'm using fakeraid on a supermicro motherboard, which according to the manual is fully supported. I've tried installing both from USB and CD-R but still no luck. I'm not dual booting with any other OS, just using 2x320gb drives and have been choosing to install using the entire disk. Any ideas what I'm doing wrong or can do to fix this? Thanks

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• GRUB 2 Error : No such disk

  - by Chandra Sekhar

  I have gone through many pains to boot through my windows 7 partition. I had windows 7, then one fine day I installed Ubuntu and again formatted the partition where Ubuntu was installed only to find the my Windows does not boot(Probably corrupted MBR). I again installed Ubuntu later but the Grub could not detect windows. So I manually added windows by editing the file 40_custom. But when I select the win7 entry in the grub, it displays the error : no such disk. What do I do?? Additional Info : Ubuntu version : 11.10 x64|| Win 7 Home premium, 64 bit|| While in the process of debugging I once also came across the error : Sector 32 being in use by FlexNet.|| Strongly in need of booting my Win 7 without any formats or fresh OS installations. Thankful for any Diagnostics and Solutions to my problem.

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• Grub Won't Boot WIndows 7

  - by STavros P.

  I have a problem with Grub 2. when i hit the Windows 7 (loader) option on the Grub boot screen Windows won't boot. i get a black screen with a white cursor blinking... Here is a log of my Boot options. I just want to delete all the other partitions which i don't know how they 've been made and stay just with the Ubuntu ext4 partition, the swap partition and the WIndows 7 partition. Can someoune help me with my problem? Here is the log: http://paste.ubuntu.com/1014619/ ps: I can only boot Windows with Hiren's Boot CD with the first option, Boot form first hard drive (win7, xp, vista).

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• Can't boot after power failure - 14.04 - GRUB even doesn't showup

  - by Nateowami

  Packages were updating when somehow the power failed (battery fully charged and power got disconnected). Now it won't boot. It doesn't even get as far as GRUB. The bios says it can't boot and press any key to retry. Fortunately all data is backed up and I can boot a live SD. Now what do I do? Model: Dell Latitude D630 Dual-boots with Windows 7, but since GRUB doesn't show up that's not bootable either. Thanks in advance for any help!

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• Grub does not autoboot the default option after upgrade to 12.10

  - by Petr Kozelka

  I recently upgraded Ubuntu from 12.04 to 12.10 and since that time, the system does not automatically boot. It always opens the boot menu, and I have to press Enter to make it boot Ubuntu. It seems to be ignoring the timeout value, and using a 'neverending' timeout. There are no other systems (no dual boot), only the options originally installed by default Ubuntu 12.04 installation. My /etc/default/grub has only these effective options: GRUB_DEFAULT='Ubuntu' GRUB_HIDDEN_TIMEOUT=1 GRUB_HIDDEN_TIMEOUT_QUIET=true GRUB_TIMEOUT=1 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX="" GRUB_TERMINAL=console I experimented with GRUB_DEFAULT, giving it values '0', '1', 'Ubuntu' but nothing helps. Yes I always run update-grub afterwards. How can I make the system booting again ?

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• About grub rescue command line

  - by khai

  Please help me.. I have two hard disk in my laptop..window 7 and ubuntu.. I have problem to back in option menu..because i enter one of the list of ubuntu.. In option menu,,have a list which operatg system i can choose between ubuntu n window7 but the list stil have another menu for ubuntu..i make mistake to choose the another list of ubuntu..and now i have to fix the command line that have grub rescue.. like this : error : no such partition grub rescue > i dont have any idea to fix this problem..i try the another step that i see at the other question but still dont have any answer..this problem is just i enter the another list but do not have any kernel,problem or somethg like that..

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• Apple Cinema Display 23" and grub

  - by Joshua Pruitt

  As per the title, I'm running my display on an older 23" Apple Cinema Display (because I still love it, darn it). I'm pushing it with an ATI Radeon DVI dual-link PCIe card. It works just fine, except GRUB doesn't seem able to push out the 1920x1200 pixel resolution needed in order to show me a boot menu! So..., I keep a smaller second monitor connected as the primary display so that I can see the boot menu and boot the system (I don't use that display once booted). This is a goofy work-around, and I'd like to just use my single display exclusively to boot the machine. I found some grub codes for higher resolutions, but not for 1920x1200. Is it capable of this? Did I just miss it? Thanks in advance!!!

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• Unable to Install GRUB in /dev/sda

  - by Henry

  I'm trying to install 12.04LTS on a server but keep running into the unable to install grub error like so "Unable to Install GRUB in /dev/sda". The drives are in raid1 and I'm using fakeraid on a supermicro motherboard, which according to the manual is fully supported. I've tried installing both from USB and CD-R but still no luck. I'm not dual booting with any other OS, just using 2x320gb drives and have been choosing to install using the entire disk. Any ideas what I'm doing wrong or can do to fix this? thanks

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• Uninstalling GRUB from MacBook Air

  - by James Brooke

  So... I have a MacBook Air and I recently tried to install Ubuntu on my external HD. I booted Ubuntu from a flash drive and everything had gone fine. I turned off my computer and when I turned it on again I got a message of error and a "grub rescue" line to enter some code. I rebooted holding the "option" key and I selected the Mac partition and everything is fine with my system, but every time I start my system and I don't hold the "option" key, I get the same error and the grub rescue message. I just want things to go back to normal, as they were before I installed Ubuntu on my external HD (which, btw, presented a message that said there was no boot loader). What do I do?

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• Grub Rescue Error: Unknown Filesystem

  - by James

  I was trying to dual boot Windows with Linux (linux installed first). I read that it was easier to do so if windows was installed first. So I tried to install windows, by creating a partition for it. There wasn't enough room on the drive so I tried changing the filesystem of my existing partition to support windows. Now whenever I try to start my computer I get the grub rescue screen. I've tried booting from CD and USB with ubuntu and also with windows, but nothing happens. I ran ls in grub rescue and got hd0, (hd0,msdos5), cd (with an install disc inserted), fd0, and fd1. However if I run ls on any of these I receive the error: unknown filesystem. Can anyone help me out?

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• GRUB fatal installation of Ubuntu 11.10 - Dual boot for Win7

  - by zero

  I have win7 installed in my system and I decided to give Ubuntu a try. I formatted my drive as follow : C:\ - For Win7 - 55G D:\ - Data - 40G E:\ - Unallocated space - 55G - This is where the installation of Ubuntu I tried to install with this partition table (All set as logical) /dev/sda6 /boot - 258 mb /dev/sda7 swap - 2000mb /dev/sda8 / /dev/sda9 /home I get this error in the middle of the installation Unable to install GRUB in /dev/sda6 Executing 'grub-install/dev/sda6' failed This is fatal error I followed this article http://www.linuxbsdos.com/2011/05/22/how-to-dual-boot-windows-7-and-ubuntu-11-04/ but it seems not working for Ubuntu 11.10. Am I missing something in the installation? Any feedback will be helpful.

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• wubi boots into grub after 12.04 install

  - by josh

  I would just like to recover the files off of the wubi install and then install a proper version of ubuntu, is there any way to recover the files? for further information. I had ubuntu 11.04 and used the update manager to update it to 12.04. it worked for aproximitely a day and then I had to do a hard reset the next day after what seemed to be artifact corruption. upon trying to reboot into ubuntu it brings up the grub command prompt "gnu grub version 1.99-12ubuntu5" i have previously done hard resets on it in the past, there is nothing in my windows hidden 000 recovery folder.

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• Boot windows from grub

  - by Parth Shah

  I had Windows 7 and Ubuntu on my hard disk. I had installed Ubuntu using Wubi. To uninstall Ubuntu I deleted the Ubuntu partitions from Windows 7 Disk Management. When I re-boot my computer it shows grub rescue. What do I need to do to re-gain access to Windows? I do not have a Windows 7 DVD. Commands like rootnoverify, chainloader do not work in grub rescue. I get an unknown command error. PS: I am posting this from another computer :)

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• Kubuntu - Roccat keyboard does not work under GRUB and works partially in BIOS

  - by Donald_W

  The system specification GRUB boot loader OS: Windows 7 / Kubuntu 12.04 LTS Keyboard: Roccat Isku Motherboard: MSI Z77 MPower with the latest BIOS SSD/HDD: Kingston HyperX 3K (AHCI in BIOS enabled), 2 other HDDs I will provide more specific configuration if needed. The problem As stated in the topic I cannot navigate in the GRUB menu using mentioned keyboard (there is no problem when I use Logitech K360). I have tried both USB 2.0 and USB 3.0 ports. I cannot enter BIOS menu as well, however if I enter it using other keyboard, Roccat seems to work and I can navigate in the BIOS menu without any issues. Any ideas how can I fix that problem?

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• Grub errors during UEFI dual boot for Windows 8 (can't find command 'drivemap')

  - by luca-mastro

  I have got a newly bought ASUS N56V with Windows 8 preinstalled. I needed to install Ubuntu so i partitioned the disk and after having disabled the Secure Boot option from Windows 8 i successfully installed Ubuntu 12.10 from a Live USB. The problem is that if i try to access both to Windows 8 (loader) and Windows Recovery System (loader) from the GRUB menu, these two errors show: can't find command 'drivemap' and invalid EFI file path and it goes back to the grub menu. In conclusion I do not have access to my Windows 8 partition but can only use Ubuntu. How can I solve the problem? I am pretty new to the matter. Thank you!

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• Reduce boot time between grub menu and login screen

  - by Sudheer

  I use Ubuntu 14.04 LTS version which used to boot fast at beginning but not i loads very slow. I searched for this but can't find suitable answers. so i want to reduce my boot time which is now around 1min 12sec (boot chart) overall but i noticed its taking a longtime after grub menu and before login screen. A Blank screen appears after grub waiting... then login screen appears. I want to know a way to reduce that blank screen time(or if possible remove) and get login screen as fast as possible. I already removed several of my startup applications. Getting desktop after log-in is fast. I don't want to remove unity and install light desktop envinorments like Xfce and Lxde. Here is my boot-chart image Thanks in advance

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• Grub errors dual boot Windows 8 / Ubuntu 12.10

  - by luca-mastro

  I have got a newly bought ASUS N56V with Windows 8 preinstalled. I needed to install Ubuntu so i partitioned the disk and after having disabled the Secure Boot option from Windows 8 i successfully installed Ubuntu 12.10 from a Live USB. The problem is that if i try to access both to Windows 8 (loader) and Windows Recovery System (loader) from the grub menu, these tow errors show: "can't find command 'drivemap' " and "invalid EFI file path" and it goes back to the grub menu. In conclusion I do not have access to my Windows 8 partition but can only use Ubuntu. How can I solve the problem? I am pretty new to the matter. Thank you!

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• two windows loader in grub

  - by Lorenzo

  i'm facing a strange problem about which - googling- i didn't find any solution. This is the issue. I've restored windows 7 trught its hidden partition then i installed kubuntu 12.04 which didn't installed the grub loader. Hence via the same usb-live i used boot-repair which have found all the system that are: kubuntu + its recovery mode windows 7 /dev/sda1 windows 7 /dev/sda2 windows 7 recovery I don't know why i have got 2 windows loader, but they seem (to me) to load the same system. I tryied to see what is there written in the grub.cfg and it seems that the "root" directory for the two system is different eventhought when i load from sda1 i got "Avvio windows" (italian laguange that i choosed) and on sda2 i got "start windows" in the english language when the splash screen load. Can you PLEASE help me removing one of the two entry? i can not really see them, i want only one but i don't know how to act.. Thank you very much indeed. Lorenzo

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• Installing multiple ubuntu partitions on same machine without corrupting GRUB

  - by LGB

  I had only ubuntu installed on my pc, but I felt like adding another ubuntu (same version) partition so I could have one just for work/study and another one just for personal generic use. I installed it and it worked out okay, but I found I needed more space on the new created Ubuntu partition, so I booted up from the Live CD, and used GParted to move/shrink/grow the partitions as the Ubuntu's tutorials suggested it was pretty straightforward. But in doing all this I messed up with Grub, so when I start my system it shows: error: unknow filesystem grub rescue What would be the easiest way to recover it so I could have both partitions working? Btw, it wouldn't be a problem for me to lose the partitions if it's the shortest/easiest way. Thanks in advance.

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• grub not detecting windows 8

  - by Satyajit B M

  I have a dell inspiron 5520. I had installed windows 8 and have ubuntu 12.04 installed in a different partition. I installed grub but it was not showing windows 8. So i added menuentry "Windows 8" { set root = "(hd0,4)" chainloader +1 } in /etc/grub.d/40_custom. Now i see windows 8 option but it says "error-invalid selection" when i select it. please help. This is the op of fdisk -l command /dev/sda1 * 16072 626807 305368 de Dell Utility /dev/sda3 7645184 500201471 246278144 7 HPFS/NTFS/exFAT /dev/sda4 500203518 976771071 238283777 f W95 Ext'd (LBA) Partition 4 does not start on physical sector boundary. /dev/sda5 500203520 870275071 185035776 7 HPFS/NTFS/exFAT /dev/sda6 870277120 886276095 7999488 82 Linux swap / Solaris /dev/sda7 886278144 976771071 45246464 83 Linux

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• GRUB not showing /dev/sda2 is Windows 7 Loader

  - by Ricardo

  A few days ago I accidentally deleted Ubuntu partition using GParted. I thought Windows 7 would start normally, but I got a "grub-rescue" screen instead. Then, I recreated a partition for Ubuntu (/dev/sda6) and reinstalled it. Ubuntu starts properly now; but GRUB shows me /dev/sda2 is Windows Recovery System (WRS), what is false, since /dev/sda1 is WRS and /dev/sda2 is Windows 7 Loader. I booted using Windows 7 disk and tried to correct this problem automatically and by bootrec.exe /fixboot and /fixmbr, and nothing is able to fix my problem. Yet, Windows (disk) says there is no OS in my computer. What should I do? Will I have to erase my hard disk to get Windows 7 back?

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• error:unknown filesystem grub rescue help

  - by Ridvan Çoban

  I'm trying to install ubuntu on my hdd which doesnt contain any operatin system, mbr or grub. (it has 3 partitions, 1st includes my data on ntfs file system, second is linux swap now, and third ex4 filesystem) Of course i don't want to lose my data on ntfs partition. Anyway i installed ubuntu on ex4 filesystem, selected sda as device for bootloader (not sda1,2 or 2). But i got error Error:unknown filesystem Grub rescue I tried ls command. It gives (hd0) , (hd,msdos1), (hd0,msdos2) and (hd0,msdos3). then tried ls (hd0)/, ls (hd0,1)/, ls (hd0,msdos2)/, ls (hd0,msdos3)/ to find the linux filesystem to boot. But i was unsuccessful. it all gave me unknown filesystem error. Am i missing or something?

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• Trying to boot from USB on Asus q200e-bhi3t45 just brings me to grub menu

  - by Krash Kharma

  It's been a struggle every time I've tried to change my OS on this machine. I honestly don't even know how it works whenever it does. I've somehow managed to get Windows 7, Windows 8, Mint 14, Ubuntu 12.04, and 12.10 to work at random times but it's always after struggling with it and googling for random chance fixes and suddenly something clicks and it loads from usb, but 99% of the time, every time I try to boot from USB to install a distro (in this case, I'm trying to get ubuntu-12.04.2-desktop-amd64.iso to work) my pc just comes up with a grub menu ("Minimal bash-like blahblahblah - grub ") I don't know why it works when it works. Right now I've tried everything from with/without Fast Boot in BIOS, with/without CSM, with/without secure boot, to changing BOOTx64.EFI to bootx64.efi to downloading a new bootx64.efi to copying it to every folder on the usb.... It makes no sense to me. Sorry if this has been asked before but I can't find anything

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