Hot answers tagged

30

In your case, the correct selection is /dev/sda, the first one. It's the first and only hard disk in your system, whereas /dev/sda1 is a partition on that hard disk. You can install grub on a partition, but it's a "BAD idea". If you had multiple hard drives and paritions, first find out where your root partition is: df | grep /$ You can then install grub ...


12

Yes, sure. $ dd if=/dev/sda of=mbr bs=512 count=1 1+0 records in 1+0 records out 512 bytes (512 B) copied, 0.000188571 s, 2.7 MB/s $ stat -c %s mbr 512 $ hd mbr 00000000 eb 48 90 d0 bc 00 7c 8e c0 8e d8 be 00 7c bf 00 |.H....|......|..| 00000010 06 b9 00 02 fc f3 a4 50 68 1c 06 cb fb b9 04 00 |.......Ph.......| 00000020 bd be 07 80 7e 00 00 7c 0b ...


12

What is a partition table? How is it related to Windows 8? In addition to general partitioning, it should be noted that information about partitions are stored in a partition table on the hard disk. The whole topic didn't receive much attention because DOS/Windows computers – where one would install Linux onto – just had one choice for almost three ...


12

There are several advantages to GPT: Supports disks larger than 2TiB. Supports partitions larger than 2TiB. Supports more than four partitions, with no distinction between primary, extended, and logical partitions. Uses GUIDs as type codes, which means there's less risk of conflicting/duplicate codes. Uses LBA addressing exclusively, compared to MBR's dual ...


9

Could you create a Bootinfo Summary report using the boot-repair tool as described below and then post the link to the report? I know you have already provided some details about your boot configuration. However, the report I am asking for contains more detailed information and might give us a better understanding of why you are unable to boot Windows ...


8

I'm the author of gdisk, and I agree with what psusi has written, with the caveat that I can't know what's really on /dev/sda5, so I can't say if it's safe to remove it. If it's the stuff that you've burned to your recovery DVDs, it should be safe to delete it, though. If there's sufficient free space on /dev/sda5 (about 17 KiB), you should be able to ...


7

Use fdisk. Put it into sector mode with the u command, then p to print the table, d to delete the partition, and then n to recreate it. When you recreate it, use the same starting sector, but an ending sector that actually fits within the disk. When you are done and have double checked ( p again ), save and quit with w.


7

See: http://www.digital-experts.de/doc/mbr/README The boot process ~~~~~~~~~~~~~ When the MBR is first loaded it waits for a configurable length of time (1 second by default), monitoring the keyboard, for key presses. If the MBR detects a key press, it will interrupt the boot process, and display it's prompt. Otherwise, it will load the ...


6

It will make no difference for you at all. Advantages of GPT are: Large partitions, more that 2 TB Unlimited number of primary partitions In your case you do not need first. Second can be achieved by creating an extended partition and creating logical ones there. For linux it does not matter to which type of partitions install (logical or primary). But ...


6

Just execute sudo update-grub and sudo update-initramfs -u. And it should be done. In case that your Windows is located on /dev/sda1 the sudo update-grub command should contain Windows 7 (loader) auf /dev/sda1 gefunden (German localization)


6

Try EasyBCD. EasyBCD is an advanced GUI application that makes it easy to modify the Windows bootloader and the entries in it. Choose BCD Deployment, and write the MBR.


5

I have solved this with a Boot-Repair disk (I put it on a USB flash-pen, but one can burn it on a disk if necessary). I had used the program mainly to repair the grub in linux, but it has an option to repair the MBR. So, boot into the Boot Repair disk/usb, and check "Restore MBR" (instead of "Reinstall GRUB"). It works fine, the normal boot in Win7 is ...


4

Installing grub to the mbr will not affect the partition table, so the recovery partition will remain intact and an entry for the recovery partition will be automatically added to the grub menu so that you can boot from it if needed.


4

menuentry "Windows 7" { insmod ntfs set root=(hd0,1) drivemap -s (hd0) ($root) ntldr /bootmgr #or chainloader +1 } If you installed Windows on partition other than (hd0,1) you need to use drivemap command to boot to Windows. Chainloader +1 or ntldr /bootmgr both can be used to boot Windows 7. What you did is you modified the VBR of the 1st partition; ...


4

Install the MBR to the disk with Ubuntu on it and configure the BIOS to boot from Ubuntu's disk instead of the Win7 one. Since you cannot boot into Ubuntu, you'll need the Live CD to boot and repair things. Boot from the Live CD. Mount the partition containing the Ubuntu installation (by opening it in the file browser for example) Open a Terminal Run the ...


4

Sometimes a total reorganization is the most easy solution, so I suggest : Completely rebuild your disk layout and keep it as simple as possible. You should place all boot loaders and operating systems on one disk. Backup the partitions you want to keep (recommended : Clonezilla). Create a new partition table on all disks (recommended : GParted). ...


4

First try to change the boot order in BIOS (UEFI) settings. Select Ubuntu to be the default operating system to boot. If this is not possible boot into Windows and disable hibernation and Fast Boot. To disable hibernation open command prompt as administrator and execute this command: powercfg /h off To disable Fast Boot open Control Panel (the old ...


3

Assuming you want to use GRUB as default bootloader, you can achieve this by reinstalling GRUB. You can use the GParted tool (available in ubuntu install media) to identify disks and partitions. If ubuntu is installed in EFI mode, boot from ubuntu install media, open a terminal and execute: (Maybe you have to change the boot order in BIOS / UEFI setup menu ...


3

To reinstall GRUB bootloader to your Ubuntu installation in EFI mode – Boot from the Ubuntu install media, then open a terminal and execute: sudo mount /dev/sda2 /mnt sudo mount /dev/sda1 /mnt/boot/efi for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done sudo chroot /mnt grub-install /dev/sda update-grub Note : sda = disk ...


3

On installation, choose the Soomething else option to open the advanced partitioning tool. Make a separate partition for /boot (500 MB in size is enough): and another one for root: You can make a separate partition for /home for your data and settings and also one for swap if you want to use hibernation on Ubuntu. Before continuing to install, you ...


3

The answer to your first question is yes, because I am doing it now. I would guess it's probably a Microsoft design decision to encourage adoption of UEFI, rather than a technical reason. UEFI allows Secure Boot and similar stuff that is more important to MS than to its customers. I don't know of a way to let windows boot from GPT with a legacy BIOS, but ...


3

It's possible and it's easier than you think. Linux can boot fine from a GPT disk in BIOS mode, so there's no need to do the MBR-to-GPT conversion. With any luck, all you'll need to do is to install a BIOS-mode boot loader (GRUB, LILO, or SYSLINUX) to the disk. There are three caveats, though: I've never used LUKS, so I'm not sure how this would affect ...


3

I got the same error message. The installation configuration that led to this message is as follows: /dev/sda1 ntfs :windows partition /dev/sda2 ntfs :windows partition /dev/sda3 ntfs :windows partition /dev/sda5 :swap partition /dev/sda6 ext4 :/ partition /dev/sda7 ext4 :/home partition /dev/sda8 ...


3

Yes, it does look like a typical MBR error message. I ended up with a similar situation, although I was able to reinstall grub from a liveCD and then boot into Ubuntu well enough. (I don't know if your boot repair program reinstalls grub; if not, I'll post the instructions below. I can't take credit for them, but I don't know any longer where I got them.) ...


3

If you had really important files in your Vista partition, then stop doing anything. If you had erased your files, each time that you write to you're disk recovery will be harder. Go to some professional that can help you to recover the files. If the files are not so important, i.e. you don't want to pay to recover them, the first thing to do is to know ...


3

Answer written by the OP in one edit: After hours of GRUB trouble, this these lines solved it in seconds: sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update sudo apt-get install -y boot-repair && boot-repair


3

It's an alignment thing For performance reasons you really want your storage to be aligned on all levels. While this is probably just a simple hard drive with a partition table and a file system on it directly, it's still important to not misalign it. What about alignment? Suppose your hard drive works with 4 kB sectors (yours appear to work with 512 ...


3

First, your partition table appears to have two active partitions, which may prevent your computer from booting even if you fix the problem of the MBR. Windows's MBR boot is kind of funky because it uses a "default" MBR to load the MBR of the active partition. Before you change the boot records, try unmarking one of the partitions and booting. If that ...


2

Should work just fine. If you want to see what the 776MB are, take a look into the folder /ext4a using nautilus or a terminal. Because it is mounted it will have an entry in the file /etc/fstab. Edit it and delete the entry for /dev/sda1 respectively /ext4a. You are also right about sda5 and sda6. sda5 is the root mount point /. That means everything that ...


2

Technically, no hybrid MBR is OK; hybrid MBRs are a clear violation of the GPT specification. Whoever invented them should be ashamed of him/herself. Unfortunately, they're a practical necessity for dual-booting OS X and Windows on Macs. (That may change with Windows 8, though.) That said, within the usual informal rules for a hybrid MBR, the one that ...



Only top voted, non community-wiki answers of a minimum length are eligible