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Thread: Cannot boot to Ubuntu?

  1. #1
    Join Date
    Oct 2013
    Beans
    8

    Question Cannot boot to Ubuntu?

    Hello,

    A couple months ago, I downloaded Ubuntu v12.04 and I made it duel-boot with Windows 8. I have Windows 8 to boot automatically, and I would have to press F12 to go to Ubuntu (I wanted it that way). It worked fine and I used Ubuntu for a few days. For a couple months, I stopped using Ununtu completely and now I want to use it again.... the thing is that when I try to boot to Ubuntu, a black page pops up saying:

    "GRU GRUB version 1.99-21ubuntu3.9 / Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else / TAB lists possible device or file completions. / grab> _ "

    I tried pressing TAB and entered a few random selections like "Linux" and "Boot" but it did nothing.

    On Windows 8, I still can see the 25GB I used for Ubuntu. It still says "unallocated".

    So what do I do now? I have two options on my BIOS to boot up Ubuntu -- they look identical (I think it is called the BIOS.... I am talking about the page that comes up when I press F12 when I turn my laptop on). When I click the top one, it brings me to the black page, when I click the bottom one, it just boots to Windows 8 even though it is labeled Ubuntu (followed by numbers and letters).

    Thanks a lot. Any help is much appreciated.

  2. #2
    Join Date
    Dec 2011
    Beans
    626
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Cannot boot to Ubuntu?

    Hi:

    Since you set Windows 8 to boot automatically:-
    It sounds like you don't have the GNU GRUB Menu !? Or am I wrong and you have a black screen with just a prompt?

    When you boot up your computer do you have the choice to use the arrow keys to either choose to boot to Windows or Ubuntu?

    It still says "unallocated".
    Unallocated means that (that space) is not partitioned. Did you create a "ext4 journaling file system" partition for Ubuntu and create a "swap" partition as well?
    So you would have to create a partiton from that "unallocated" space.


    To be sure what is going on with your system you may want to use a Live Linux CD (the one you have with Ubuntu on it should work) and post the output of:
    AS ROOT
    Code:
    fdisk -l
    \\
    Small letter L:-
    "A morning w/o coffee is like something w/o something else"


    Voyager 12.04 Xubuntu based on AMD Phenom Quad Core & CentOS on Sony Vaio


  3. #3
    Join Date
    May 2007
    Location
    The New Forest
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    Hidden!
    Distro
    Xubuntu Development Release

    Re: Cannot boot to Ubuntu?

    Thread moved to Installation & Upgrades.

    not sure why this was in other o/s with a pclinuxos prefix

  4. #4
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Cannot boot to Ubuntu?

    Windows will not see Linux partitions, so that is normal.

    May be best to see details. You can run this from your live installer flash drive or DVD or download a new CD version repair disk.

    Post the link to the BootInfo report that this creates. Is part of Boot-Repair:
    https://help.ubuntu.com/community/Boot-Info
    Boot Repair -Also handles LVM, GPT, separate /boot and UEFI dual boot.:
    https://help.ubuntu.com/community/Boot-Repair
    You can repair many boot issues with this or 'Create BootInfo' report (Other Options) & post the link it creates, so we can see your exact configuration and diagnose advanced problems.
    LighterWeight (Lubuntu based) Boot-RepairCD
    http://sourceforge.net/projects/boot-repair-cd/files/
    Full Ubuntu 13.04 liveDVD or USB Flash drive Installer with Boot-Repair included (for newer computers)
    https://help.ubuntu.com/community/LinuxSecureRemix
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  5. #5
    Join Date
    Oct 2013
    Beans
    8

    Re: Cannot boot to Ubuntu?

    @UltimateCat

    Thanks for reply.

    Anyways, yes, it is a black screen with a prompt. I do have to use the keys to choose whether to boot to Windows 8 and Ubuntu but ONLY when I click F12 when I first power on my laptop. And yes, I did create the swap partition.

  6. #6
    Join Date
    Dec 2011
    Beans
    626
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Cannot boot to Ubuntu?

    Your Welcome: Andrew_Paulus
    It's my pleasure to assist you and others here in the forum.

    Anyways, yes, it is a black screen with a prompt.
    In that case you can try typing:
    Code:
    starx
    At the prompt and see if that boots you into Ubuntu.
    If not, try:
    Code:
    Ctrl+Alt+F1
    And that should give you a way to log in (in commandline mode)
    If you are able to log in and still have a black screen with white letters and your in console mode than try: "startx"

    Another way to boot from a prompt is to know what the output of "ls boot" is. That's usually the boot (grub) partition.
    Code:
    ls/boot
    If you can get to your /boot/grub/grub.cfg file that would reveal some good infornation too.

    If none of that works than it could very well be that you need Boot Repair. ( A part of Grub or your Master Boot Record needing repair)
    Post the link to the BootInfo report that this creates. Is part of Boot-Repair: that our Moderator oldfred advised-
    "A morning w/o coffee is like something w/o something else"


    Voyager 12.04 Xubuntu based on AMD Phenom Quad Core & CentOS on Sony Vaio


  7. #7
    BlinkinCat is offline Iced Blended Vanilla Crème Ubuntu
    Join Date
    Aug 2011
    Beans
    Hidden!

    Re: Cannot boot to Ubuntu?

    Hi,

    I believe the command UltimateCat meant to relay was -

    Code:
    startx
    Cheers -

  8. #8
    Join Date
    Oct 2013
    Beans
    8

    Re: Cannot boot to Ubuntu?

    I tried the following commands and nothing happened each time (other than it saying "Unknown command"): starx, startx, ls/boot, lsboot, ls boot, and I tried Ctrl+Alt+F1....

    What now?

  9. #9
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
    Beans
    6,765
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Cannot boot to Ubuntu?

    Andrew_Paulus; Hi !

    We are trying to find out where you are in the boot process.
    When you are at that prompt, what returns from the simple command:
    Code:
    ls
    That return will give us the indication of where you are in that process. Whether grub has loaded and if you have got past grub.

    just try'n to help
    THE current(cy) in Documentation:
    https://help.ubuntu.com/community/PopularPages

    Happy ubutu'n !

  10. #10
    Join Date
    Dec 2011
    Beans
    626
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Cannot boot to Ubuntu?

    Quote Originally Posted by Andrew_Paulus View Post
    I tried the following commands and nothing happened each time (other than it saying "Unknown command"): starx, startx, ls/boot, lsboot, ls boot, and I tried Ctrl+Alt+F1....

    What now?
    Try:
    Code:
    ls
    by it's self and see if it gives you any output. Post that output here.
    If that only gives you "unknow command" than I am suspicious that your boot partition is missing.
    If indeed your boot partition is missing than you will have to re-install Grub to the Master Boot Record.

    ls/boot is for to see what the kernel and intrd files are.
    Than you can manually boot with the linux intrd commands.
    Once we find where "/boot" is than you can boot with something like (this is just an example)
    linux (hd?, gpt?) /boot/<name of kernel> root =dev?


    Can you get the output of the command with a Live CD?
    It would really help if you can. This way we can see all the partitions on the computer to determine what you have and what is missing.
    Code:
    fdisk -l  (small letter L)
    "A morning w/o coffee is like something w/o something else"


    Voyager 12.04 Xubuntu based on AMD Phenom Quad Core & CentOS on Sony Vaio


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