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Thread: Pre boot errors - where are they logged?

  1. #1
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    Pre boot errors - where are they logged?

    Hi, I'm new to Ubuntu and still am on a learning curve.
    I have a 14.04, now successfully updated to 3.17-utopy kernel.
    When my laptop boots, I see for a very short time a few errors coming up before the login screen. I do want to check them out and possible fix, but its so fast I can't see anything and I do not know where are they logged. Was wondering if anyone can help me with that.
    Last edited by Alex_Botev; January 15th, 2015 at 01:18 AM.

  2. #2
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    Re: Pre boot errors - where are they logged?

    /var/log/ is the directory that you're looking for.

    I would say that you ought to see /var/log/boot.log (system boot log) and /var/log/dmesg (kernel ring buffer)

  3. #3
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    Re: Pre boot errors - where are they logged?

    Quote Originally Posted by Alex_Botev View Post
    Hi, I'm new to Ubuntu and still am on a learning curve.
    I have a 14.04, now successfully updated to 3.17-utopy kernel.
    When my laptop boots, I see for a very short time a few errors coming up before the login screen. I do want to check them out and possible fix, but its so fast I can't see anything and I do not know where are they logged. Was wondering if anyone can help me with that.
    Open a terminal and type
    Code:
    dmesg
    Also try
    Code:
    cd /var/log
    ls
    is where all the system log files can be found.

    Good Luck
    Hypertension = Take with a pinch of salt
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  4. #4
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    Re: Pre boot errors - where are they logged?

    +1 for both posts above.

    Since you see 'errors' at boot, you can disable the splash screen and check what errors show up at boot.
    You can edit /etc/default/grub file to edit the following line:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    and change it to:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT=""
    "Evolution is Nature's way of issuing upgrades."


  5. #5
    Join Date
    Jan 2015
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    Re: Pre boot errors - where are they logged?

    Thanks guys for the good answers. It turned out its my iwlwifi complaining that it does not have -9 or -10 version driver (since I downgraded it to -8 because of this bug(https://bugs.launchpad.net/ubuntu/+s...e/+bug/1289961) and personally seeing big improvement in speeds with -8 in comparison with the rest) .
    Just for any new to say that to get the fantab solution working you need to also do sudo update-grub2 before rebooting.

  6. #6
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    Re: Pre boot errors - where are they logged?

    Quote Originally Posted by Alex_Botev View Post
    Just for any new to say that to get the fantab solution working you need to also do sudo update-grub2 before rebooting.
    Yes, I forgot to mention that. My bad.

    Code:
    sudo update-grub
    "Evolution is Nature's way of issuing upgrades."


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