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Sorry if this is a stupid query, but I spent ages getting the Samsung NP905S3G to boot from usb and eventually got it to work. Wanted to try a dual-boot alongside windows 8 first and the install seemed to work but I now can't figure out how to boot the laptop in ubuntu without the usb. It keeps starting in windows no matter how I configure the BIOS. Any help welcome. Thanks

Edited to explain further : I think Ubuntu has installed successfully. My problem now is getting it to boot.

Nuwan Thisara
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skypotatoes
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    It is almost always an option in your BIOS under boot or EFI or secure boot options. See http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-10-with-uefi , first answer, troubleshooting section. – Panther Nov 15 '16 at 19:56
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    The use of large font and bold do not help in any way. We understand your computer boots directly to windows. Did you read the troubleshooting section in the link I gave you ? This is a bios / efi issue as ubuntu runs fine when booting from usb. – Panther Nov 15 '16 at 20:20
  • The use of large font wasn't intentional. – skypotatoes Nov 17 '16 at 13:32
  • I did read the troubleshooting section, but I am not finding any GRUB menu or other option to boot from ubuntu anywhere in the BIOS - it only has Windows. I am going to take another look tonight. – skypotatoes Nov 17 '16 at 13:35

1 Answers1

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You need to install Grub on your boot partition to make your computer a dual boot, open Ubuntu from the installation disk and go to terminal and input:

sudo fdisk -l

To learn which partition is the boot loader, in this example it's sda1.

and enter this command:

sudo mount /dev/sda1 /mnt

then this command:

sudo mount --bind /dev /mnt/dev

then this command

sudo chroot /mnt

then this command

grub-install /dev/sda

then this command

update-grub
Muaad ElSharif
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  • Muaad, thanks for these instructions. I discovered the boot partition is sda1 as in the example then entered the second command you gave and nothing appeared to happen. Then I entered your third command and it said: 'mount: mount point /mnt/dev does not exist' – skypotatoes Nov 17 '16 at 17:06
  • This is probably beyond my current abilities, but I am wondering if I go ahead and do a full format & install of ubuntu and forget about dual booting, will I still have these boot problems with Ubuntu? – skypotatoes Nov 17 '16 at 17:20
  • I'd say that's an overkill Ronan, the question was marked as a duplicate so follow the procedure on already answered questions and good luck. – Muaad ElSharif Nov 17 '16 at 18:03
  • I tried the bit in troubleshooting but all that happened is windows appears twice as a boot option! I think I have reached the limit of my abilities and need to find someone who knows Linux to help :) thanks for your advice – skypotatoes Nov 17 '16 at 18:05
  • You installed Ubuntu first then you installed Windows, right? – Muaad ElSharif Nov 17 '16 at 18:06
  • I edited my answer, take a look at it now and tell me what happens with you, I want to help you Ronnan! – Muaad ElSharif Nov 17 '16 at 18:10
  • Reinstalling grub never resolves this problem, see http://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-10-with-uefi "TROUBLESHOOTING

    YOUR COMPUTER BOOTS DIRECTLY TO WINDOWS

    This is a common problem and if you do not get a GRUB menu , re-installing or repairing grub will NOT HELP"

     – Panther Nov 18 '16 at 18:29
  • Hi, thanks Muaad, just taking another look at this now. Sorry for taking days at a time to reply, and thanks for your help. I installed ubuntu onto a computer that already had windows. – skypotatoes Nov 20 '16 at 15:01
  • Muaad, I tried your steps again just now but with the same result, "does not exist" – skypotatoes Nov 20 '16 at 15:07
  • bodhi, I followed the troubleshoot instructions but all that happened is that the option to boot from windows now appears twice in the BIOS. I still see no sign of Ubuntu or GRUB in the BIOS and have been through all the menus. Thanks all for your help. – skypotatoes Nov 20 '16 at 15:09