Questions tagged [grub]

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

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Auto-Generate Timeout=0 on Grub, XCP-ng/Xen/CentOS

XCP-ng is a XenServer fork that runs on CentOS. XCP-ng 8.2 regenerates the GRUB file when changing the control domain memory allocation, which results in the server not automatically booting. The GRUB ...
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grub-install fails to identify FS properly

I am installing Arch Linux in a Vbox and encountered the following error I formatted /dev/sda in ext4 so I am not quite sure what's happening here with grub-install (v.2.04) complaining about the ...
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HPE ProLiant gen 10 in legacy boot mode does not see hard drives in boot order section

I have HPE ProLiant gen 10 server with 8 drives. If I use legacy boot mode, but there is nothing in legacy boot order setting. And server tries to boot just from the ethernet. I have installed grub on ...
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Apache2 stopped working after upgrade to v2.4 ((38)Function not implemented: AH00141)

I was happily running apache2 and mysql on a Ubuntu 16.04 server with no problems, but yesterday I noticed that there were a bunch of updates available and I installed them using apt-get. One of the ...
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182 views

Debian Stuck at Booting from Hard Disk after installation on KVM

I'm trying to install Debian on Qemu-KVM on RouterOS v5.25 I tried : debian-10.8.0-i386-netinst.iso debian-8.11.0-i386-kde-CD-1.iso debian-live-9.0.0-i386-gnome.iso on disk image created using : qemu-...
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Grub2-install: warning: Couldn't find physical volume in Centos 7

After replacing the disk with raid 1, I have this problem: grub2-install --recheck /dev/nvme0n1 Installing for i386-pc platform. grub2-install: warning: Couldn't find physical volume `(null)'. Some ...
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103 views

What is the difference between “Kernel messages” and “Messages from the init system and the system logger”

In this blog, it gives a Recommended serial kernel parameters, PCs with video card. console=tty0 console=ttyS0,9600n8 It says Kernel messages will appear on both the first virtual terminal and the ...
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Alpine setup on virtual machine UEFI does not boot

I am trying to setup Alpine linux on a VM (Proxmox) to replicate the layout of physical hardware (raspberry pi). The real layout is a raspberry pi 3, installed as "data" mode (based on wiki) ...
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271 views

How to boot ZFS root filesystem after setting dnodesize = auto (making grub unable to read the disks)

I have a proxmox (v5.4 I think) installation on top of ZFS in a server with 6 disks. There are 2 pools: rpool in a mirror of two SSDs that has the proxmox root filesystem and some containers and zvols....
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Centos8: VM broken after moving from VMware ESXi to HyperV [closed]

I have moved Centos8 VM from ESXi to the HyperV 2019 core (hdd only) It seems the disks or partitions IDs are broken so it's not staring up properly using default/first Grub menu option. But it runs ...
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147 views

Post kernel update: Only OVH's rescue kernel works - but why doesn't mine?

I just went through upgrading from Debian 9 to Debian 10 and I am having a weird issue. Probably not too weird to people that do more intensive sysadmin things, which is why I bring it here: During ...
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Can't boot DL360 with disk of other DL360 (raid1 with SmartArray)

I would need some help on a topic I don't really masterize :) I have a Proliant DL360 G9 (server1) 2 disks in Raid1 (disk1 & disk2), using HP SmartArray My server went KO, and I used another ...
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GRUB2 theme looks broken after update (2.02->2.04)

Coming from Grub 2.02, and upgrading to 2.04, adding it to our TFTP server for PXE booting; I built the new grub2 image as in: /tmp/rebuild_grub/bin/grub2-mkimage -c ./grub-embedded.cfg -p '(tftp)/...
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Detect different keys on GRUB2 menu

I have a GRUB configuration that looks like the following, where I would like to detect different key inputs so I can act accordingly, but this does not work by default: echo "" echo -n &...
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Issues Booting Ubuntu 18.04 LTS (Server) after cloning from another drive

I have an Ubuntu server running 18.04 LTS. Not long ago, I had to clone the drive of this server to another machine to make repairs, and now I need to reclone it back to the server again. This time, I ...
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ZFS RAIDZ1 root on gentoo fails to boot after disk swap

I have a 3-disk RAIDZ1 array with 3 HDDs: # zpool status ... config: NAME STATE READ WRITE CKSUM gpool ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 ...
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138 views

arch linux on zfs root cannot configure grub on bios

as the title suggests I cannot get across the finish line installing arch on zfs. I get to the point where I try and install grub on my /boot after chrooting into my /mnt from the live cd. anyway ...
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922 views

How do I make grub install on a software-raid disk?

I am running Debian 9 with mdadm RAID 1 on it. Previously both hard-drives could boot into the OS, now only one of them can. I have recently had a faulty disk which needed to be replaced, so replace ...
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1answer
241 views

Auto boot degraded RAID1 on Debian 10 (Buster)

I want my server to boot without manual intervention on degraded RAID1 from second drive on Debian 10 (Buster). It boots when I detach the second hard disk but it doesn't boot when I detach the first ...
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77 views

CentOS 7: small smiley face on boot?

I've got a problem with a CentOS 7 dedicated server. I've had it for years, and never had any problems with it until now. I did a yum update the other day, and then rebooted the machine, and it ...
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129 views

GRUB partition accidentially formatted on Ubuntu 18.04

I am facing a case that the the 1MB GRUB partition on an Ubuntu 18.04 server has been accidentially formatted. The server has not been restarted yet. Upon running sudo update-grub the following ...
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935 views

Ubuntu GRUB installation failed

I am currently in the process of setting up an Ubuntu server but I ran into a few problems... after setting up RAID 0 (two 160GB drives) I tried to install Ubuntu server 18.04.3 LTS but it failed ...
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186 views

How create RAID 1 on working Slackware 14.2?

I use Slackware 14.2 (with kernel 4.4.14-smp) on sda and I'm trying to create the RAID 1 with additional sdb. I'm using the VM VirtualBox. First, I have cleaned the sdb: dd if=/dev/zero of=/dev/sdb ...
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928 views

QEMU-KVM: VM will not start with virsh, only with qemu-system-x86_64

I have a vanilla Arch linux VM with disk in qcow2 format. I recently upgraded it and it stopped working. Every time I run $ virsh start Arch I get: Starting version 243.78-2-arch ERROR: device 'UUID=&...
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284 views

UEFI PXE NFS boot issue with multiple network adapters

I have a working PXE server which detects the client side as either BIOS or UEFI and boots network clients successfully. The purpose of this system is to network boot physical servers in order to ...
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22 views

How can I get kernel / early boot output over my NVIDIA GPU using CentOS 7?

I recently installed CentOS 7.7 with KDE on a machine with both onboard graphics and an NVIDIA GTX 1080 Ti. I got the proprietary NVIDIA drivers installed, but it was quite difficult as I couldn't see ...
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1answer
244 views

How can I generate/or edit a grub.cfg on each EFI partition that refers to the ubuntu installation on the same physical disk?

I have an install of Ubuntu 16.04 server set up on two disks with software raid across two large partitions. The start of each disk contains an EFI partition. I would like to be able to boot from ...
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133 views

Are my EFI partitions mutually bootable? How to interpret the output of efibootmgr -v

I have two GPT formatted disks both starting with EFI partitions and followed by a single physical raid partition. I installed ubuntu-server 16.04 with software raid over these two raid partitions and ...
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126 views

Finding the menu.lst that is being used by grub on a multiboot/multipartition system

How do I find which partition holds the menu.lst being used at boot time? Not looking for multiple locations , as where the file could be, but where it is definitely to be found. (e.t. partition) Is ...
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201 views

GRUB installing CentOS 7 on CentOS 6 machine with kickstart

I am wondering if someone can provide some help. I am trying to do an automated install (with kickstart file) with CentOS 7 on a CentOS 6 server. However I have failed multiple times so far. I did ...
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432 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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577 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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430 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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80 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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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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109 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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4k 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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6k 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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496 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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468 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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482 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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481 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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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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18k 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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213 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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436 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
3k 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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794 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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195 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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510 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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