Bootloader issues: what happens before the operating system itself starts.

learn more… | top users | synonyms

2
votes
0answers
303 views

Fedora now tries to connect to wireless at boot?

In my Fedora 16 installation I've recently noticed that it tries to connect to wireless at boot (I have kernel messages turned on at boot so I can see it trying). The issue though is that my wireless ...
4
votes
1answer
5k views

Uninstall the Encrypted LVM function to remove the prompted password entry during Ubuntu Boot

When I installed Ubuntu 11.04 and I was offered the option of enabling "encrypted LVM" for my hard drive. After choosing that option, I am prompted for my password during boot to decrypt the LVM. ...
0
votes
1answer
556 views

Why can't I boot off my Debian update CD?

I downloaded a .iso file with the name debian-update-6.0.4-amd64-DVD-1.iso from http://debian.org and burned it with k3b with default settings, but unfortunately found it won't boot. Did I download ...
1
vote
1answer
72 views

Is S25mdadm start script priority correct?

(On Ubuntu 11.10 - configuration inherited from 10.10) Occasionally the boot process seems to suffer a race condition where a starting process misses some of the Raid-1 FSes, build via mdadm. ...
1
vote
1answer
684 views

pxe boot: problems with /etc/resolv.conf

I'm pxe booting a node (Ubuntu 11.10). The image of the node is created with debootstrap. Works great. Everything is loaded. When I login to the node I see that /etc/resolv.conf is empty. In the base ...
3
votes
2answers
289 views

How does the kernel “give up” control to distribution-specific initialization?

I've always wondered how the kernel passes control to third-party code, or specifically distribution-specific code, during boot. I've dug around in GRUB's configuration files, suspecting a special ...
2
votes
2answers
649 views

slitaz cooking grub2 loopback

I'm trying to get slitaz cooking ISO to boot using a grub2 loopback on a multiboot USB; # /boot/grub/grub.cfg insmod font if loadfont /boot/grub/unicode.pf2 ; then insmod efi_gop insmod ...
1
vote
1answer
8k views

Slow boot on Fedora 16: why and how to improve?

I recently installed Fedora 16 on a Dell VOSTRO 1510. I am quite happy with it, but I am concerned with the slow boot load time. I measured from launching the OS with GRUB till GDM, a boot load time ...
2
votes
1answer
137 views

/etc/rc*: Why does this command stop NFS services from starting at boot?

I recently found this home networking tutorial surprisingly enlightening. However, there is one thing I don't understand: Disabling NFS Start On Boot: If you are not planning on regularly ...
10
votes
2answers
410 views

“Grep breaks, causing the boot process to hang forever”

Question within a question (from the Debian wiki): Should I use sid on my desktop? If you think you can handle a broken Debian system, sure. Do you know what to do if libpam0g breaks, ...
4
votes
2answers
6k views

Kernel Panic - not syncing: VFS: Unable to mount root fs after new kernel compile

So I've been at this for a while and have been poking around for an answer for a few days, and figure it's about time to ask for help. I am running Ubuntu 10.10 in VMWare Fusion, and have downloaded ...
2
votes
4answers
6k views

Unable to boot the operating system

I installed Lubuntu 11.10 and it run without problems. I decided to install Ubuntu 11.10 mini instead of Lubuntu 11.10. After the installation the operating system didn't boot. I only saw the black ...
2
votes
2answers
386 views

Fast distro which only allows a USB boot?

Older PCs BIOS don't have the ability to boot from USB and there is no upgrade from the motherboard manufacturer that makes that possible. Usually I load UNetbootin to make the USB bootable. Since ...
1
vote
0answers
2k views

GRUB2 and EFI - File not found?

I'm running Linux on a 8,3 2011 MacBook Pro. It uses EFI/rEFIt to boot. I was able to install GRUB2 EFI support, and it shows up just fine in the rEFIt boot menu. Everything seems to be working ...
1
vote
1answer
3k views

What's the difference between 'no caching page mode present' and 'assuming drive cache. write through.'

Post-POST, post-BIOS screen, post-GRUB; when I boot Debian with a SD card or USB stick plugged in, one of the first things to pop up on the screen (so quickly that usually I don't even notice) looks a ...
3
votes
7answers
19k views

Black screen at boot with Mint and Ubuntu live CDs

I just bought an HP pavillion g6 laptop, with the hope of installing Linux on it. I have now tried both Linux Mint (my first choice) and Ubuntu, and both simply give me a black screen from the moment ...
6
votes
3answers
2k views

Is there a way to speed up boot time by loading things into RAM immediately?

I'm looking to lower my boot time by whatever means possible. I have about 8GB of RAM in my laptop, and if there's any way I could leverage that into faster boot time, that'd be awesome. Is there a ...
2
votes
2answers
177 views

Determining longest time taken in boot process

I'd like to find out what takes the most time in my boot process from GRUB to the Ubuntu login screen. How can I profile my boot process to find out what's taking so long?
3
votes
1answer
2k views

Trouble booting CentOS

I switched from an Ubuntu to the CentOS yesterday. But it seems I have messed my installation somehow, since OS will only start correctly if the USB with the installation is plugged in. Long story: ...
4
votes
2answers
2k views

Multiple root options in Linux command line

My kernel command line looks like this: root=31:0 ro noinitrd console=ttyS0,115200 root=/dev/mtdblock2 rootfstype=squashfs I think the first root entry identifies a disk by its major and minor ...
2
votes
1answer
2k views

Altering the default boot option on CentOS

I recently installed a copy of CentOS onto my main hard drive (I now have Windows 7 and CentOS). Whilst installing CentOS, I accidentally set it to be the main boot option, so when I start my PC I ...
2
votes
1answer
2k views

Disable detection of certain hardware?

I have a computer with two PCI TV cards. One is Compro (Win friendly), another is Leadtek (Linux friendly). Now, I'm trying to optimize my Ubuntu boot process and I would like to disable detection of ...
0
votes
1answer
2k views

Fedora 16 won't boot

Last night, I shutdown my system, and when I tried to boot it this morning it hung at the splash screen. What is wrong here? I'm not sure which details I can give apart from that I originally ...
2
votes
1answer
68 views

Problematic booting process

About a month ago I installed Lubuntu 11.10. Since that time there is a problem with booting and shutting down. Booting is endless. This screen never disappears, so I have to manually press the ...
3
votes
2answers
527 views

Choosing a device name under /dev from the kernel command line

I am booting CentOS via a USB install. The boot method is simply booting the ISO from GRUB2 installed on the USB Key. The USB key always gets the "name" /dev/sda. Can I change that name from the ...
3
votes
1answer
156 views

Is it possible to create a bootable usb from a partition?

Is it possible? How hard would it be to do so?
3
votes
3answers
378 views

How do I troubleshoot this boot issue?

I have a Lenovo x120e that is not booting properly. When I turn it on, it just opens to a blank screen. The machine is running Ubuntu 10.04. Main Details: I shut the lid of the computer while it was ...
0
votes
2answers
3k views

Please explain Solaris boot sequence in detail

Its same question for Linux here at Please explain Linux boot sequence in detail but emphasis on Solaris style of things. I am preparing a document in detail showing light on the boot sequence of ...
12
votes
4answers
3k views

discribe in details tha boot process of any linux system

I am preparing a document in detail showing light on the boot sequence of Linux right from pressing of Power-on button the host to the login prompt appearance. It would be great if we could combine ...
0
votes
1answer
1k views

LMDE does not boot directly after install, but boots from cd option “boot from local hard drive”

Just got a new (used) pc from my job. Still a nice beast, Intel board with Core 2 quad CPU and 4G of RAM. So I came to install Linux Mint Debian Edition on it. The live CD works like a charm, and ...
-1
votes
1answer
429 views

Set Kernel Root to Same Partition as Boot

Running GRUB, I want to set the kernel root parameter to the same partition (or more generically, to a partition on the same device) as the disk with the bootloader. Initially, the install set the ...
2
votes
3answers
415 views

How does setting the Setuid bit affect shell scripts that run on boot of the system, before any login has occurred?

Would enabling the setuid bit on a shell script make a difference at all when that script is run on boot? Who would the effective user be?
4
votes
2answers
251 views

How do I make sure grub is only installed once?

I currently have Windows on one partition, and Ubuntu on another. I'd like to install Quimo, and possibly Mint and/or Lubuntu as well. How do I make sure that only Ubuntu has Grub, and that the ...
8
votes
3answers
16k views

How to set global environment variables at boot through a script, and have them available for an application that runs before login?

I have a service that runs at boot, and in that service it calls a bash script in the background that exports some environment variables. The problem I'm having is that those environment variables ...
4
votes
1answer
179 views

What does this [number] beginning many lines during the Linux boot screen represent?

My Linux sandbox boots into the text mode. During the boot process many lines are prefixed with a number between brackets ie. [40.000] Normally this number reaches upwards to 80. Recently I've noticed ...
0
votes
1answer
2k views

Error with grub2 installation on Backtrack 5

I installed BackTrack 5 r1 and I can't select boot option between Windows and BackTrack on start up. How can I fix this, or how can I install grub 2?
2
votes
1answer
699 views

Kernel can not boot after upgrade on Fedora OS 15

I am using Fedora 15, and want to upgrade to version 16. I followed the official link Upgrading Fedora using yum - FedoraProject to upgrade my OS by the following command: yum update kernel* ...
8
votes
3answers
3k views

Why does initramfs mount the root filesystem read-only

What is the reason for the root filesystem being mounted ro in the initramfs (and in initrd). For example the Gentoo initramfs guide mounts the root filesystem with: mount -o ro /dev/sda1 /mnt/root ...
1
vote
1answer
1k views

Boot device /dev/sda1 does not exist on Debian in QEmu

I have an image of Debian/LXDE assembled for ARM and I trying to run it in Qemu. I am using this command: sudo qemu-system-arm -M versatilepb \ -kernel ./vmlinuz-2.6.32-5-versatile \ ...
3
votes
3answers
1k views

Avoid pause during dm-raid initialization

On my CentOS 5 workstation I get a few seconds wait after dm-raid45 has been loaded ("Initializing Driver" or something like that). This seems to be part of the initrd. After that the system boots ...
5
votes
2answers
2k views

How to manually manage grub.cfg for Grub2?

I am setting up my system. The features of it are: GPT partition table (not sure how important this is) Triple boot - Gentoo, Debian and Mint. Custom kernel (kernel git repo) shared amounst distros. ...
4
votes
2answers
514 views

Can applications like VirtualBox run at startup without any users logging in ubuntu?

This question comes to mind because we are tinkering with the idea of going VM with some of our servers. KVM is a bit involved, VMWare acts like they want to be a free product, and Microsoft is just ...
4
votes
3answers
1k views

rc_status always returns “failed”

One of our developers has a service that needs to be started on boot. This script needs to be fired: /app/bt/preview/apache-tomcat-5.5.27/bin/startup.sh Here is the startup script I'm working ...
3
votes
2answers
277 views

Why does linux scan my cdrom on boot?

My linux system scans my cdrom on boot. Can I disable that feature without removing my cdrom tray?
3
votes
2answers
782 views

Arch Linux cannot boot

I have a WD My Passport USB 3.0 500 GB HDD I have successfully installed various OSes like Ubuntu, Pinguy, Mint etc. but so far I'm unsuccesfull in installing Arch Linux. I used the net install CD ...
6
votes
2answers
1k views

How can I boot the PC-BSD live DVD-ISO IMAGE directly via GRUB2?

Via the loopback command, GRUB2 allows to directly boot an ISO file. Now, I've configured the according menuentry to boot the PC-BSD Live DVD ISO, but when I try to boot it, the FreeBSD bootstrap ...
7
votes
1answer
2k views

Booting a file system image from a HDD using GRUB2 with persistence

How do I preserve changes I make to files when running an operating system that is booted - using GRUB2 - from a file that contains a file system. I managed to get GRUB2 to boot an image file that ...
8
votes
3answers
17k views

What is the “Bootable flag” option when installing a distro?

Is the "bootable flag" needed in today's distributions? If not, then Why is it still in the installers? What is it exactly?
8
votes
1answer
6k views

Enable num-lock as default in Linux

There has been a similar question - but IMHO there has to be a simpler solution. If num-lock is on in the BIOS - why is it turned off during linux boot and/or KDE/Gnome/whatever startup?
0
votes
0answers
434 views

“Error inserting microcode” on new install of Fedora 15

I started getting an error that looked like this the other day, and I Googled the problem but couldn't find the solution (probably because I don't quite to know what to Google), so I reinstalled the ...