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Thread: Can't enter grub screen

  1. #1
    Join Date
    Jan 2008
    Beans
    2

    Can't enter grub screen

    I've installed Ubuntu 10.04 server edition and want to enter the recovery mode.

    After reboot the system, it directly enter the login window, no grub screen shows.

    If I click esc when booting the system, it stops loading and shows a blinking cursor infinitely.

    What's the problem here? Is there some way to trouble shooting?

  2. #2
    Join Date
    Jan 2008
    Beans
    2

    Re: Can't enter grub screen

    Here is my grub settings in
    Code:
    /etc/default/grub
    Code:
    GRUB_HIDDEN_TIMEOUT=0 
    GRUB_HIDDEN_TIMEOUT_QUIET=true 
    GRUB_TIMEOUT=10
    And I mistakenly removed myself from sudo list

  3. #3
    Join Date
    Aug 2009
    Location
    West Sussex, England
    Beans
    117
    Distro
    Ubuntu

    Re: Can't enter grub screen

    I had this same issue and in the end booted from a live CD such as systemrescueCD.

    I can not test this today, but I have a suspicion you cannot enter the grub menu any more since grub2 replaced grub.

    If I get time to play I will post back my findings.
    Richard Holloway
    PHP Developer and System Administrator
    http://richardjh.org

  4. #4
    Join Date
    Aug 2009
    Location
    West Sussex, England
    Beans
    117
    Distro
    Ubuntu

    Re: Can't enter grub screen

    OK I am back with news.

    In grub2 you can no longer use ESCAPE key to enter the menu, you need to use the SHIFT key instead.

    This has been documented at https://wiki.ubuntu.com/Grub2

    The relevant section is below, section highlighted bold for reference:


    GRUB_HIDDEN_TIMEOUT=0

    *

    The hidden timeout option is available to single-OS computers - if multiple OS's are known to Grub 2, this option is bypassed.
    *

    On single-OS systems, the menu will be hidden unless a # symbol is present at the beginning of this line. ( # GRUB_HIDDEN_TIMEOUT=0 )
    * The default setting initially depends on the presence of other operating systems.
    o Another OS Detected: The menu will be displayed. ( The line will begin with a # symbol. )
    o No other OS Detected: This setting is not used, as determined by the
    * For integers greater than 0, the system will pause, but not display the menu, for the entered number of seconds.
    *

    0 The menu will not be displayed. There will be no delay.
    o The user may force displaying the menu as the computer boots by holding down the SHIFT key (single-OS computers only).
    + During boot, the system will check the SHIFT key status. If it cannot determine the key status, a short delay will enable the user to display the menu by pressing the ESC key.
    + If enabled, the splash screen designated in 05_debian_theme will be displayed even if the hidden menu feature is selected.
    There is a bug for this https://bugs.launchpad.net/ubuntu/+s...b2/+bug/439592
    Richard Holloway
    PHP Developer and System Administrator
    http://richardjh.org

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