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Questions tagged [grub]

Console application permitting the user to choose between several installed operating systems.

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14 views

fail to install windows server 2016 via centos7 pxe boot

I want to install windows server 2016 via the pxe server using uefi mode.I have already set up these services of http, dhcp, tftp, xinetd. I have already achieved to install RHEL7.3 via the centos7 ...
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1answer
21 views

Grub incorrectly escapes $ character in its settings

Not sure where I make mistake but I can't escape $ correctly in /etc/default/grub. I'm on Ubuntu MATE 18.04. This is what I do: In console I edit confid by calling sudo mcedit /etc/default/grub I ...
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2answers
225 views

Can't get grub2 boot menu via COM2 port

I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub': GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" ...
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1answer
27 views

Grub stuck at menu until I connect to console using VNC

I installed an Ubuntu 16.04 Server virtual machine on FreeNAS. Everything works as expected, except GRUB. When I reboot the machine with sudo reboot, it does not boot automatically. Every time I have ...
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24 views

Editing /boot/grub/grub.conf not recommended - yet how do you then change entries?

For example, our /boot/grub/grub.conf looks like this: ## ## End Default Options ## title Debian GNU/Linux, kernel 3.2.0-4-amd64 root (hd0,0) kernel /boot/vmlinuz-3.2.0-...
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17 views

Cloned Ubuntu Server - Grub disk no longer present on apt update

I have many cloned Ubuntu Server (Bionic) systems, image was done using Clonezilla. This morning, I did an apt upgrade and those grub packages upgraded: Preparing to unpack .../04-grub-pc_2.02-...
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1answer
18 views

grub2 starts after grub rescue while trying to save my debian server

After screwing up in Debian Jessie (accidentally run rm -R /) my server stopped responding and I decided to reboot. After rebooting grub rescue started and tried to fix it by running the following ...
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39 views

How to reinstall correctly grub on Omniosce?

OmniosCE is similar to solaris. Works fine but..I cannot boot with bsdbootloader. So I want to try grub,I follow this way. a)booting with installation cd b)Select option n.4 "shell" c)Import rpool ...
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0answers
37 views

How to setup bootable RAID 0 on remote server

I have a remote server with 2 identical 500Gb SSD, sda and sdb. A rescue mode is also available from the cloud provider's interface. How to get Debian installed on a bootable RAID 0? I understand I ...
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2answers
270 views

grub-pc which “install device” should I chose?

I have been running ubuntu 18 on linode for about 6 months and just did "apt update" followed by "apt upgrade". It asked me which grub file to use, for which I selected "keep current file" as this is ...
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63 views

What causes the error: Unknown filesystem: grub rescue

I'm running Debian Wheezy on an embedded hardware for IoT. For any reason I got twice the following problem in a few days: Unknown filesystem grub rescue: I know how to recover from that error, ...
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41 views

Need a Grub Fix

I am running Fedora 27, but you wouldn't know it from this output: # cat /etc/os-release NAME=Generic VERSION="27 (Generic)" ID=generic ID_LIKE=fedora VERSION_ID=27 PRETTY_NAME="Generic 27 (Generic)"...
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1answer
576 views

mount: mounting /dev on /root/dev failed: No such file or directory after converting lxc to virtual machine

I've been trying to convert an lxc container to a virtual machine, but I've encountered a problem when trying to boot. I end up with the (initramfs) command line and I've got the following errors: ...
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2answers
148 views

install grub 0.97 to new 4TB disk

Stooped question but I cant understand why it not work. I have rhel 5.5 kernel 2.18. I clone OS from 750 gb disk to another 4 TB disk. I parted disk to 2 partition. 10gb sda1 40 gb sda2 I clone ...
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1answer
44 views

Grub2 fails to detect partitions if it was installed into file

I'm trying to prepare an image that I can dd into disk or boot using PXE. Some context: I create an image, partition it using sfdisk (MBR), create loop devices for the whole disk and main partition, ...
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1answer
108 views

ext4 corruption leading to unbootable disk. Partition is mountable, but grub detects unknown filesystem

I'm trying to recover from a system disk corruption issue without having to reinstall the OS, which would be super-painful currently. I'm using Ubuntu 18.04, the affected partition is ext4 and on a ...
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1answer
319 views

Can't boot into ubuntu server 16.04 after successful installation

I've installed 16.04 on Dell R710 server on RAID6. Boot mode is set to UEFI in BIOS. After successful installation it stays in grub> console. Output to ls command is (hd0) (hd1) (hd1,apple2) (...
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44 views

Not booting from hard disk after Installation from USB?

I downloaded kali 32bit images from Official Kali website, then installed on my existing windows 7 machine erasing and creating a single partition. Now, after rebooting error: no such device: ...
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1answer
4k views

KVM gets stuck at “Booting from hard disk”

I am trying to run Ubuntu-server-16.04 virtual machine on a KVM converted from .vhdx (Hyper-V) to .qcow2 (KVM). When I import my virtual disk image and start virtual machine, the KVM hangs on "...
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0answers
167 views

Customized Red-Hat 6.7 to 7.4 upgrade

I have a customized RHEL6.7 server, it has several LVM2 partitions, the root volume is LVM2 based and is located on: stats/rootvol im editing the current GRUB (0.97 which part of RHEL67) to look like ...
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294 views

grub2 RAID1 disk failure - unable to boot

Background I am setting up a server with software RAID1. This includes the /boot partition being mirrored (mapped to md0). My aim is that if one of the two hard drives containing the OS (sdc and sdd) ...
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1answer
1k views

editing the value of GRUB_CMDLINE_LINUX_DEFAULT thru bash script

I want to append fastboot to the end of the existing value of the GRUB_CMDLINE_LINUX_DEFAULT variable in /etc/default/grub not manually, but by using bash script and echo command. The problem is that ...
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1answer
279 views

Automated install using preesed - grub confirmation message issue

I am performing an automated install of a custom ubuntu 14.04 server using a combination of preseed and kickstart methods. Everything is fine except the annoying grub confirmation message as shown ...
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0answers
111 views

How can I get a Linux *partition* image to boot in a XenServer virtual machine?

I am trying to migrate a Linux PC to a virtual machine running in XenServer. Normally I would just create an image of the boot disk (/dev/sda) with dd and use that to overwrite an empty virtual disk ...
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0answers
413 views

Fedora 26 UEFI/EFI Rescue Boot

I need to rescue an unbootable UEFI Fedora 26 system. I have booted from the DVD, and used the rescue choot environment. I have a GPT disk with a small FAT32 ESP partition of type EF00. I've run: ...
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2answers
424 views

How-To Chain Boot/Trampoline Boot into Ubuntu 17 on PCIe SSD without BIOS support

I have a server-grade SSD (Intel DC P3520) that will eventually end up in a server. Until the server is deployed in the data center I want to conduct some tests in a desktop machine. I have an older ...
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1answer
893 views

install grub in a usb and boot proxmox from another drive

Good morning my friends! I'm tryng a solution before buy some new hardware. So this is my situation: I have some beautifull hp dl360p gen8 that comes with an p420i hardware raid controller. What ...
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3answers
803 views

GRUB hangs before menu, after a HDD upgrade. How to debug?

I have a problem on a server with 4 x 1 TB drives running Debian wheezy and GRUB 1.99-27+deb7u3. sda and sdb have partitions mirrored using (Linux software) RAID1, including /boot. sdc and sdd have ...
1
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1answer
848 views

dracut: Switching root

After my hosting company did some changes (no technical description for them) I got the following boot error for my CentOS: What I must do to get my servers up! I tried to ask for support at the ...
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2answers
783 views

What is Grub-install actually doing?

I have a client who accidentally converted the partition table of one of their Linux system from DOS to GPT. Unfortunately, the GRUB version is 2, and the system didn't have a BIOS boot partition for ...
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1answer
55 views

How to handle grub when adding new system and removing old one?

I want to upgrade my Proxmox cluster from 2.2 to 4. I think I have this well thought, but there's one thing I am not sure of. Currently, my installation runs on LVM A. I have added few new disks and ...
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1answer
763 views

'Could not find filesystem /dev/root' after Clonezilla clone of redhat install to newer hardware'

I am cloning what appears to be a redhat 4 (possibly 5?)server to fairly newer hardware, as the original has a failing board. DBA would rather not reconfigure a new installation so they want me to ...
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0answers
137 views

How to diagnose why Grub won't boot a Windows partition?

I just imaged a Windows partition onto a new drive with dd. Then I changed the NTFS UUID to a new one. Then I ran update-grub (using grub2) and restarted. Now there is a new menu entry in the Grub ...
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1answer
186 views

Error message encountered when booting a debian VM

When booting a Virtual Machine powered by a Debian 8 "Jessie" distribution, this error message appears : Error 24: Attempt to access block outside partition 1 I'm quite sure that it's a GRUB problem ...
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411 views

Removal of soft raid-1 array causes linux system to grub rescue mode

root@R1:~# fdisk -l Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors Device Boot Start End Blocks Id System /...
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2answers
375 views

Ubuntu: updated mainline kernel, now drops to initramfs

I attempted to upgrade our system's mainline kernel and am now dropping into initramfs. < update>: The commands I used were: apt-get update apt-get upgrade apt-cache search linux-image //grabbed ...
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0answers
126 views

GRUB “USB lock” for Linux Full Disk Encryption

Hy everyone. I'm investigating the possibility of using something like USB hardware locking dongles (like these ones used for software locking and licensing) to provide the key that Grub asks for ...
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1answer
61 views

Centos 5.4 wont boot

I have three disks in a centos server but it won boot,I have no grub at all.I tried to install grub with super grub and fix the system with rescatux but in vain.Is there a way to boot into centos?Here ...
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1answer
74 views

How can I get into debian to edit grub settings when grub is hidden and shift key does not bring up menu?

I wanted to hide GRUB during boot, so that I can access the list of OS whenever I want to boot something other than the default. I hid GRUB by specifying in /etc/default/grub that GRUB_TIMEOUT=0 ...
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0answers
844 views

grub-pc update fail, /dev/sda, ext2 doesn't support embedding

Recent update created the grub-pc "File system `ext2' doesn't support embedding." error. I looked all around and found most chiming in that people were installing grub on a partition not the MBR. Well ...
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0answers
82 views

I can not login with the root user's credentials

I have a server deployed with CentOS 6.8. This morning, without anyone on my team touching anything, we not have access to server with the credentials of the root user (this server is private and ...
0
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1answer
73 views

Centos 6.8 failed reboot dedicated server

Ok so I bought/rent a dedicated server from nocix with Centos 6.8 installed, also came with 2 hard drives sda - 128GB SSD & sdb - 2TB HDD and I think I made a mistake by partitioning the second ...
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2answers
2k views

PXE boot with grub: root variable unset

I configured a dhcp and tftp server, for my tests, I used at first time, syslinux to boot over PXE network successfully. Now I want to use grub instead of syslinux to boot, in order to do that, I ...
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2answers
844 views

Kernel Panic on CentOS - Google Compute Engine Instance

I'm getting a kernel panic error in a CentOS instance of Google Compute Engine. I'm able to see the error and already figure out how to solve it, but I can't get into the GRUB menu trough the serial ...
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1answer
625 views

How to change boot drive on server with RAID 5 software raid

I have my hardware-owned dedicated server hosted in remote datacenter, running CentOS release 6.4 (Final) with grub (GNU GRUB 0.97). Server has 6 2TB drives with 2 software raids on them - md0 raid 1 ...
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0answers
821 views

Debian 7 can not boot, grub rescue show error: out of partition

Debian 7 amd64 running in VirtualBox 5.0.10, on Windows 8.1 ent x64 host. This VM running more than 1 years. Use basic partition, NOT LVM or any Raid. Today it's suddenly auto umount all disk, and ...
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0answers
168 views

Grub loading error 21

I have a 2-disk software RAID CentOS 6 system that I just installed. When I boot from the disk I get "Error 21" from GRUB. I have run this command on sda and sdb, after booting from the rescue DVD ...
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1answer
32 views

How can I start grub using grub on my new installation

I have installed a Scientific Linux 6 (like Centos 6) on my first drive sda and use it as my working linux, in order to continue to user my working ditribution I have Installed a Scientific Linux 7 on ...
3
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1answer
824 views

Solaris 10 x86 hangs on boot

I have an old server running Solaris 10 x86 64 bit. Haven't had issues with it but recently it was powered off without a clean shutdown. That hasn't been an issue in the past with reboots from the ...
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1answer
170 views

Cannot Boot Centos Machine on GCP (Google Compute)

I have a Centos 6 server that's been running fine for 6mths on Google Compute Platform for the past 6mths. Without a restart - it froze this morning and on reboot is producing the following errors ...