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Thread: kernel won't boot: can I find out why not?

  1. #1
    Join Date
    Apr 2006
    Beans
    9

    kernel won't boot: can I find out why not?

    Hi all,

    I am currently running Lubuntu 12.04. I have installed the linux-lowlatency package from the repos; it's the one that according to the package, always depends on the latest one. Right now that's 3.0.2-23.31, according to Synaptic. I also have a real-time kernel installed, a similar version. Don't get me wrong: that one is not from an official PPA, and I'm not in any way suggesting that anyone help me with that one.

    I also have the regular generic one installed, version 3.20-24.37. When I start my PC up and choose the low-latency kernel or the real-time kernel from the GRUB menu, the screen stays black. When I choose the regular one, my Lubuntu installation boots up like a charm. I'm concluding that something about those kernels is causing my system to hang, and it's likely to be something they have in common (which is why I mentioned the real-time one).

    Now my question is: what happened to those text messages Linux systems used to scroll across the screen during startup? I know they're still out there because I've seen them in other recent distros. How can I turn those back on, so I can write down and Google whatever message is on the screen when the kernel hangs? Is there any way to check logs? I already turned the "No" in /etc/default/bootlogd to a "Yes" but /var/log/boot remains empty. There's a /var/log/boot.log but that only seems to show the last successful boot, which is nice, but not very helpful.

    Any tips on how I can go about investigating the problem? If you've got an awesome tip to actually solve it, that would also be welcome, but I'm fine with doing some more research on my own.

    Thanks in advance for pointing me in the right direction!

  2. #2
    Join Date
    Apr 2006
    Beans
    9

    Re: kernel won't boot: can I find out why not?

    Nobody on the official Ubuntu forum can point me to the kernel logs?

  3. #3
    Join Date
    Jul 2007
    Location
    Magic City of the Plains
    Beans
    Hidden!
    Distro
    Kubuntu Development Release

    Re: kernel won't boot: can I find out why not?

    To see text on booting, edit /etc/default/grub and change the line

    GRUB_CMDLINE_LINUX_DEFAULT="splash quiet"

    to

    GRUB_CMDLINE_LINUX_DEFAULT="text"

    Then run
    Code:
    sudo update-grub
    and reboot.

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