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My main OS is windows 7. Today I installed Ubuntu 13.04 alongside Windows. After successful installation everything seemed right. I could install programs and change system settings etc. However, when I rebooted my computer I had the error: No such device (Grub rescue). I've looked for solutions on several websites.

I tried using a boot-repair disk but now I cannot access Ubuntu any more. It's like my laptop is not dual-booted any more as I do not have the option to choose the OS on start-up.

Boot info script: http://paste.ubuntu.com/5974211/

Simon
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user183239
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5 Answers5

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You have to change BIOS to boot external drive first, then internal drive. Then if external drive is not plugged in, it will boot the internal drive and just boot Windows, if plugged in it boots grub/Ubuntu.

You have Windows boot loader in sda, and grub2 in sdb, so Windows boots directly from internal drive and Ubuntu boots from external when plugged in, and will give the option to boot either Windows or Ubuntu.

oldfred
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The problem is that your bootloader is stored on your second hard disk while its looking for it in the first hard disk.

so from your live-cd run boot-repair and install bootloader to /dev/sda

abchk1234
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Have you install Ubuntu after Windows? you should install ubuntu after windows because its bootloader is very particular and the installer tends to overwrite the entire hard drive, wiping out any data stored on it.

conqueror of all miseries
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after using

sudo grub-install /dev/sda

please also use

sudo update-grub

This would update the grub configuration.

Then set 1st hard disk as default in the bios menu, plug in the second hard disk, and reboot.

Tell us how it goes..

abchk1234
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you can use sudo update-grub command in ubuntu actually if there is more than one os installed in your system then this command will update your grub(GNU GRand Unified Bootloader)

conqueror of all miseries
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