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Thread: Ubuntu boot error, no video signal after grub

  1. #1
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    Jun 2012
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    Ubuntu boot error, no video signal after grub

    Hi guys, I'm very new at this so bare with me...

    So I'm using ubuntu 12.04 installed on a 1TB external hdd.
    After logging into ubuntu, I updated the video drivers (using home desktop with ATI, at work its nVidia) and after the reboot, i can no longer boot? (not sure if this is right description)

    So I get to grub (is that like the boot menu?) and then I try the first option which is normal boot (as opposed to recovery). Then I get the purple ubuntu screen, a screen of text and before I can read it, the monitor loses video signal.

    I'm not sure what I can do at this point, I really need to get back on to work

    Any help is appreciated! thanks!

  2. #2
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    Re: Ubuntu boot error, no video signal after grub

    Yes, grub is the boot loader.
    The issue will be the video drivers you loaded, ubuntu (actually linux in general) can be pretty picky about these.

    Edit - deleted my advice, oldfred's is better.
    Last edited by debodas; December 15th, 2012 at 12:48 AM.

  3. #3
    Join Date
    Jun 2009
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    Chicago Suburbs
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    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Ubuntu boot error, no video signal after grub

    Some older info on using two differnt video systems.

    Boot using recovery mode & 'Reconfigure graphics' or
    Create Portable Ubuntu for 2 different Video Cards - script
    http://ubuntuforums.org/showthread.php?p=8107778
    There is a application named switchconf that lets you choose between xorg.conf files at boot.
    http://meandubuntu.wordpress.com/200...on-switchconf/
    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.




  4. #4
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    Jun 2012
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    Re: Ubuntu boot error, no video signal after grub

    Thanks for the responses,

    @kingnick42, when I get to the root shell prompt, after entering sudo apt-get purge nvidia*
    I get
    W: Not using locking for read only lock file /var/lib/dpkg/lock
    E: Unable to write to /var/cache/apt/
    E: The package lists or status file could not be parsed or opened.

  5. #5
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    Jun 2012
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    Re: Ubuntu boot error, no video signal after grub

    So after unlocking the read only mode I tried sudo apt-get purge nvidia* and it was fine and I got it to boot, but it quickly resulted in the same signal loss for my monitor... although this time it showed the cursor

    After I tried again by removing ati as well with sudo apt-get purge ati*, and an error occurred..

    The following packakes have unmet dependencies:
    libc6 : Depends: libgcc1 but it is not going to be installed
    Depends: tzdata but it is not going to be installed
    E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by he ld packages

    I think the "he" is the and is just a typo lol...

    Also @oldfred, How can I go into Reconfigure graphics through recovery mode? And thanks for those links!

  6. #6
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    Ubuntu 12.04 Precise Pangolin

    Re: Ubuntu boot error, no video signal after grub

    I do not know about AMD/ATI, but with nVidia I always have to use nomodeset on first boot until I have nVidia driver installed.

    How to set NOMODESET and other kernel boot options in grub2 - both liveCD & first boot, but different
    http://ubuntuforums.org/showthread.php?t=1613132
    https://help.ubuntu.com/community/BootOptions
    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.




  7. #7
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    Re: Ubuntu boot error, no video signal after grub

    I just tried booting with the nomodeset option, still not working... is there another way to completely remove al ati installations? I think thats the issue... (i've already tried sudo apt-get purge)

  8. #8
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    Jun 2012
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    Re: Ubuntu boot error, no video signal after grub

    Also when I try the safe graphics mode, it tells me "no monitors" or something along that lines.

    Another error that might help is
    rt2800pci_mcu_status error: mcu request failed no response from hardware
    I get that when restarting from root terminal

  9. #9
    Join Date
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    Re: Ubuntu boot error, no video signal after grub

    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.




  10. #10
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    Jun 2012
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    Re: Ubuntu boot error, no video signal after grub

    OMG IT WORKS!!!!!!!!!!!

    Haha thanks oldfred, it seems that the link http://wiki.cchtml.com/index.php/Ubu...allation_Guide worked for me (followed the Removing catalyst/fglrx section)

    Now i'm on no graphic drivers and things are awkward but i can work on this! I"M SAVED!!!

    Thanks

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