Ubuntu Installation :: Determine Boot Device Number?
Jun 30, 2011
I'm currently running Ubuntu (w/ GRUB) and Windows XP. I'd like to remove Ubuntu and run the recovery on Windows XP because it has started not running correctly. The computer is about 5 years old and I figured I'd just wipe it clean and start over (read: remove Ubuntu and reinstall windows via the recovery console).
I intend to follow the tutorial here: [URL]
However, I'm confused about determining the boot device number for Windows. I've run "sudo fdisk -l" and I can identify the windows drive in the list it says:
Device: /dev/sda1
Boot: *
Start: 1
End: 19352
Blocks: 155444908+
Id: 7
System: HPFS/NTFS
Am I looking for the 7, the 1, or something completely different? This is also the first partition on the list.
sda2 (id: c) is a FAT32 drive. I think this is the recovery partition included on the HP desktop.
sda3 (id:83) is Linux
sda4 (id: 82) is swap
I just need to run fixmbr.
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Mar 17, 2011
I just compiled my first own kernel (I'm using Arch Linux), following the tutorial on the german site. Now I tried to boot it, I ended up failing with this message: Code: Waiting 10 seconds for device /dev/sda1 ... Root device '/dev/sda1' doesn't exist, Attempting to create it. ERROR: Unable to determine major/minor number of root device '/dev/sda1' Here is the important part of my menu.lst:
[Code]....
I simply copy&pasted the Arch-entry, i.e. I also had the disk by uuid there. The failure message was the same, just the root device name was the different name Also, at first I did not have the initrd line in my menu.lst (as written in my tutorial that I may not need it). In this case I had this error message:
[Code]....
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Oct 1, 2010
how to get the card number and device number on system for attched USb audio device?
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Apr 5, 2011
I m using SUN Server .
How would i determine the number of RAM slots using dmidecode.
I m running following command to get RAM information. code....
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Jul 1, 2010
Can someone explain how to determine the number of blocks to determine the number of cylinders for a new partition on hard drive.
Why is block size divided by 1024?
I think I understand unit size is the total bytes per cylinder, I get that. I understand the anatomy of the hard drive (i.e. heads, sectors, cylinders.
My problem is, if I need to calculate the number of cylinders needed for let's say a 20G partition on a 120G drive.
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Sep 9, 2010
When running cat /proc/cpuinfo under Linux, a variety information is kicked-back. For example:
> cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU 5130 @ 2.00GHz
[Code]...
First, what does all of that actually mean? I see I have a processor 0 and processor 1. Does that mean Linux is reporting both cores of the CPU, or, since it is a VM, the two that I happen to have right now (even if they're on physically different CPUs)?
Second, how can I get a similar information dump form the command line in Windows? Third, is there a way using either platform to determine the number of physical CPUs versus total CPU cores?
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Mar 4, 2010
if there's a tab-delimited file under /usr/desktop, how can I determine the number of rows and columns of the file in shell?And, if told the the 3rd column of the file contains only numerical values and all values in the 5th column are unique, how can I verify these in shell?
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Aug 31, 2010
When I run apps like mplayer to use my web cam it uses /dev/video#. For reason unknown to me this number changes and is usually either 1 or 0. I have looked on the Internet after struggling to find how to know which /dev/video device is used. So far I can only presume I have used the wrong terms to find how to determine which device the web cam is using.
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Apr 16, 2011
Reboot and select proper boot device or insert boot media in selected boot device and press a key. I got this error after: Reducing my Windows 7 partition by about 100gb. Creating a new partition (100gb) and copying my Ubuntu partition (10gb) to the new partition. After it was copied, and pasted, the original partition was deleted. I now had two partitions a new 100gb Ubuntu partition and a 600gb (or so) Windows 7 partition.
All of this was done using a bootable USB with Ubuntu 10.10 and GParted partition editor. Now when I boot I get the "Reboot and select proper boot device or insert boot media in selected boot device and press a key." error.
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Dec 4, 2010
I was having ubuntu 9.10 on my desktop installed as "WUBI"(installed inside windows). Very recently(yesterday) i had some package upgrades showing up. I installed the upgrades, among them one was called "GRUB PC". I though it was a normal gurb update. what i see is the my windows boot loader also has been corrupted and GRUB cant access my UBUNTU also. The error which i get is this
"error: No such device:<big number here...>"
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Sep 20, 2010
When CentOS boots up, it tries to determine the IP for a network device (eth0) and fails.
'Determining IP information for eth0... failed; no link present.'
I'm curious to know how, after booting up, I could set the IP information for a wireless device, wlan0, manually. Another way of putting this questions is: if CentOS is able to determine IP information for a network device on bootup, what settings is it configuring exactly?
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Jul 20, 2010
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Oct 30, 2009
I'm writing a bash script that needs to know whether or not a device node is part of a RAID array. I'm just curious if anyone knows of a good way to determine if a device node is in a RAID array. I know that you can run mdadm -Q or mdadm --examine on the device node and that will tell you. But I don't want to rely on screen scrapping and would rather have something that would return a boolean. Any ideas?
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Jul 31, 2011
I'm having a problem trying to customize Ubuntu 11.04 LiveCD.Everything went well until I tried to run the system updates on the LiveCD.This is the error message output:
Code:
root@lkjoel-desktop:/# sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
code....
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Apr 29, 2010
In KDE's Konsole, I can do the following from the terminal:
dcop kwin KWinInterface currentDesktop
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How can I determine what desktop number the current gnome terminal in a gnome session is connected to?
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Nov 19, 2009
Is there a way to determine the IO size that is being used for reads and writes to an attached storage device? I am trying to pattern the IO sequences to storage. I have seen mentions to max_sectors_kb but the notes indicated that changing this value did not change the IO size to the storage.
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Feb 1, 2010
I put my two SATA hard drives in a new computer (new mb, cpu, no pci SATA adapter, built-in nVidia graphics), and I thought everything was going well. The Mythbuntu logo came up, but the bar at the bottom did not move. It eventually dropped me out to a (initramfs) prompt.
When I used the recovery mode, this is where it had problems:
[ 4.756000]ata1:SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 5.068000]ata2:SATA link down (SSTatus 0 SControl 300)
[ 5.552000]ata3:SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[ 5.864000]ata4:SATA link down (SSTatus 0 SControl 300)
[Code]....
I had a SATA PCI card in my old computer, would adding that to the new system make it work? Is there someway to update the UUID numbers (I think I have done this before).
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May 19, 2010
Installed ubuntu 10.4 over previous ubuntu on Intel 945G. After installation and reboot the system does not boot: "no bootable device - insert boot disk and press any key".
Installation was done from USB-stick, prepared by UNETBOOTin. I have two HD's, one used for system + storage, another one just for storage. I manually deleted previous system partitions of previous ubuntu install in system HD. The system HD had about 1/3 of free and unallocated space for system partitions, which ubuntu installer created during the installation.
I tried to reinstall grub from bootable USB-stick and it succeeded but it did not help. The system is still not bootable.
I have used ubuntu for years and never happened something like this. Am I missing something or is ubuntu missing something???
HW failure is ofcourse possible but I am quite skeptical about it because Live ubuntu from USB-stick works well.
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Jan 2, 2010
i had a working multi-boot system, vista on sda1,2; swap sda3; ext=sda4; ubuntu sda5; fedora sda6; data sda7 - i mount the data partition when using all of the linux releases so i don't have to have multiple copies of music, docs, etc. everything has worked fine until yesterday. i tried to install fc12 on sda6, replacing fc11. it required me to format sda6 as ext4. i wasn't sure where i had grub installed, but have a backup of menu.lst in data (sda7), so figured i could let it install to mbr or wherever it wanted to by default. when the install completed and i reboot, i get a black screen and these messages: CLIENT MAC ADDR: 00 19 XX XX XX GUID: XXXXX PXE-E53:
No boot filename received
PXE-M0F: Exiting Intel Boot Agent.
No bootable device -- insert boot disk and press any key I tried reinstalling fc12, same exact errors. I then thought maybe the problem had something to do with ext4 partition mixed in with ext3's, so i installed mepis on the sda6, and let it write grub to mbr (i think, not really sure where it wrote it). anyway, i still get the identical black screen. no grub type menu or anything. the screen used to show "DHCP for a few seconds", but doesn't anymore after i disconnected the ethernet cable.........
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Sep 17, 2010
In previous Fedora, we may add the following line to /etc/modprobe.conf
options loop max_loop=64
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However, this method no longer works in Fedora 13.
May I know how to increase loop devices in Fedora 13?
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May 10, 2011
How can I know what number descriptor is used by my usb device indicate via libusb_device_handle structure ? I can't find declaration of libusb_device_handle structure. I need this information to use poll() function where I need decripttion number of device.
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May 10, 2011
How can I know what number descriptor is used by my usb device indicate via libusb_device_handle structure ? I can't find declaration of libusb_device_handle structure. I need this information to use poll() function where I need decripttion number of device.
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May 30, 2010
My only issue that I can't figure out thus far is the remote. I'm using a Hauppauge Nova-T USB Stick, and generally the setup for the Nova-T 500 is good. No problem with lircd.conf, .lircrc etc. My problem is that the remote doesn't work on startup. Looked in /etc/lirc/hardware.conf and it says, as expected: REMOTE_DEVICE="/dev/lirc0"
Which doesn't work because I have no /dev/lirc0 (I do have a /dev/lircd). However, running /proc/bus/input/devices, I discover that my IR receiver is event5, so if I change the /etc/lirc/hardware.conf to: REMOTE_DEVICE="/dev/input/event5"
And restart lirc, it works fine. Unfortunately, upon restarting the PC, the IR receiver doesn't always have the same path - eg it could be event6 or event8 etc - so then I need to fix the /etc/lirc/hardware.conf again.
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Aug 25, 2010
I used to have 2 HDDs for ubuntu: 1 x 80GB and 1 x 500GB The 500GB disk was my /home directory and is now used exclusively for Windows 7. I have now moved /home to the 80GB drive and have modified /etc/fstab to point /home to /home rather than /dev/sdb1. However, I cannot boot into ubuntu. I have tried using Super Boot Disk cd-rom but still no joy. I think I need to fix grub and have tried by booting into a Live-CD and following a tutorial I found on the forums but it complains about not being able to find a device.map I guess this has something to do with the fact that the 500GB HDD is now gonoe but am not sure how to resolve this issue. how to recreate this file but the command failed.
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Dec 19, 2010
My old Dell Inspiron 9300's CD Rom is no longer working. I've written the files to my 8GB USB device, and attempted to boot from it. Whenever I try, I get this "No boot sector on USB device". I'm also using Mac OS X to make the USB drive.
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Aug 18, 2011
I'm trying to install 11.04 onto a custom build pc.I have burned an install CD of the desktop edition and have inserted it into the drive, started up, and tried to run the live version. IT pops up, everything works, Hooray! I go to install it to disk and I follow all the prompts and it needs me to reboot to start. YAY! I click to reboot, remove the CD as requested, and then I get the "No Boot Device Detected!" error message.
I then tried installing straight from the CD and not booting into the live version. I follow all the steps and get a congratulations on installing it and all I need to do it reboot. I remove the CD, reboot, and BANG! the same message. I'm not sure what's up or even where I can get information from because there is no BIOS splash screen or anything to naviagate through.
System Specs:
Intel Atom Mobo/Proc (1.66Hz)
8GB Corsair RAM
1 slim optical drive (SATA)
1 2TB Seagate HD (SATA)
1 Case/PSU combination
EDIT1: Currently I am checking the live CD for defects (though it has an internet connection so I'm unsure whether the CD matters).
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Oct 3, 2010
i wanted to see the red hat side of things and do some virtualization with CentOS, so i am trying to dual boot ubuntu 10.04 LTS and CentOS 5.5. the machine is a laptop, toshiba A100 series. what I did was to create the following partitioning scheme via Ubuntu LiveCd
Code:
Device Boot Start End Blocks Id System
/dev/sda1 * 1 19457 156288290+ 5 Extended
/dev/sda5 1 2103 16892284+ 83 Linux
/dev/sda6 2104 9988 63336231 83 Linux
/dev/sda7 9995 12623 21117411 83 Linux
/dev/sda8 12624 18800 49616721 83 Linux
/dev/sda9 18801 19457 5277321 82 Linux swap / Solaris
created an extended partition and in there have made sda5 and sda6 as / and home for ubuntu and sda7 and sda8 as / and home for CentOS. and sda9 as swap. I installed ubuntu first and then installed CentOS with no bootloader. Run sudo update-grub through ubuntu and now i have both Ubuntu and CentOS available. But when i select CentOS, i have an error which reads "invalid magic number".
I have grub2 installed, haven't downgraded or done anything to it and the ubuntu install is fresh, one week since i updated to 10.04 from scratch. I have found much contradictory stuff on google, but not something that provides a definite solution and also this post but the second command provided in the solution is one i cannot understand very well and it doesn't seem to work. what I am doing wrong here and how to make this work. I would prefer to do things via Ubuntu since debian stuff is what i am comfortable with and i am installing CentOS to learn not to do work on it.
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Feb 4, 2010
I recently built a "new to me" computer and can't get it up and running. HDD's, DVDROM, Mem is all detected ok. But just won't boot linux for some reason.
Heres the setup
ASUS P4C800 w/P4 2.4Ghz
2GB RAM
Excelstor 160GB (IDE)
WB 80GB (IDE)
SONY DVDRW (SATA)
BFG (nvidia) R84512GSP video
Tried different combination's of which drive is mstr/slv boot order with and without the new memory(1bg of it) nothing seems to work. I'm trying to install Ubuntu 9.10 I can get to the main screen where you have the option of live/install. Once you need to get past that I get a blinking cursor on the top left of my screen...and thats it. I've tried letting it sit and makes no difference. This happens with every distro I've tried to boot, Ubuntu, Fedora, CentOS, they all crap out at the exact same spot, got be hardware right.
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May 13, 2010
Today I installed Fedora (I need it for school), but not everything seems to work fine Before installing Fedora on my Macbook I had a triple booting machine: Mac OSX snow leopard, Windows 7 and Ubuntu. (using rEFIt) All of them where working. Since I installed Fedora on the 4th partition I can only boot Mac OSX. When selecting one of the other OS's it says: "no bootable device insert boot disk and press any key"
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Jul 11, 2010
When I boot off of Debian Kernel 2.6.26-2-686. This is what happens. It stops at attached scsi generic sg5 type 0 After 4 or 5 minutes it comes back and says.
Gave up waiting for root device. Common problems Boot args (cat /proc/cmdline) Check Root= (did the system wait for the right device) Missing modules (cat /proc/modules; ls /dev Alert /dev/sdd8 does not exist dropping to shell /bin /sh: can't access tty; job control turned off If I boot off Debian Kernel 2.6.26-2-686 (single user mode) Then use Control-D it boots fine.
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