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Thread: Problems Booting 20.04.4 on a Dell Latitude 7400

  1. #1
    Join Date
    Sep 2014
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    Problems Booting 20.04.4 on a Dell Latitude 7400

    Actually this is kind of an update to this issue from a year ago:
    https://ubuntuforums.org/showthread.php?t=2443622

    Then the solution was to upgrade to 20.0.4. However, over the course of the last year the situation got gradually worse. I *only* re-boot when suggested after a kernel update, but I needed more and more tries to get the boot started. As of now I need ca.20 tries ending up on a dark, slightly illuminated screen before I get a normal boot. I can boot from safe mode, but then some stuff like my docking station does not work properly.

    The machine is a 1-year-old Latitude 7400 laptop which had 18.0.4 as OEM from Dell when I bought it. The 18.0.4 still exists on another partition but does not boot (as a year ago). Then I created an issue on a Dell forum which was pushed around and eventually died out.

    Right now I am kind of afraid to re-boot, since I don't know whether it gets up.

    Any ideas?

  2. #2
    Join Date
    Apr 2008
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    11,705

    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    I read that old thread to get up to speed and suspect the kernel jump from the 5.4 series to the later "hwe" series kernels may be the culprit. But first lets gather a bit of info.

    Please post the output of these commands:

    Code:
    ls /boot
    Code:
    uname -r
    Code:
    apt policy linux-generic*
    Code:
    ubuntu-drivers list-oem
    Note: the last one of those will take a while to complete and may well display nothing at all once the terminal prompt appears again.

  3. #3
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    Sep 2014
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    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Sorry, just realized that post.
    Code:
    mkuemmel@bruce-2:~$ ls /boot/
    config-5.8.0-44-generic      memtest86+.elf
    config-5.8.0-45-generic      memtest86+_multiboot.bin
    efi                          System.map-5.8.0-44-generic
    grub                         System.map-5.8.0-45-generic
    initrd.img                   vmlinuz
    initrd.img-5.8.0-44-generic  vmlinuz-5.8.0-44-generic
    initrd.img-5.8.0-45-generic  vmlinuz-5.8.0-45-generic
    initrd.img.old               vmlinuz.old
    memtest86+.bin
    Code:
    mkuemmel@bruce-2:~$ uname -r
    5.8.0-45-generic
    Code:
    mkuemmel@bruce-2:~$ apt policy linux-generic*
    linux-generic-hwe-18.04-edge:
      Installed: (none)
      Candidate: 5.4.0.67.70
      Version table:
         5.4.0.67.70 500
            500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
            500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
         5.4.0.26.32 500
            500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
    linux-generic-hwe-20.04-edge:
      Installed: (none)
      Candidate: 5.8.0.45.51~20.04.31
      Version table:
         5.8.0.45.51~20.04.31 500
            500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
            500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
    linux-generic-hwe-20.04:
      Installed: 5.8.0.45.51~20.04.31
      Candidate: 5.8.0.45.51~20.04.31
      Version table:
     *** 5.8.0.45.51~20.04.31 500
            500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
            500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
            100 /var/lib/dpkg/status
         5.4.0.26.32 500
            500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
    linux-generic-hwe-18.04:
      Installed: (none)
      Candidate: 5.4.0.67.70
      Version table:
         5.4.0.67.70 500
            500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
            500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
         5.4.0.26.32 500
            500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
    linux-generic:
      Installed: (none)
      Candidate: 5.4.0.67.70
      Version table:
         5.4.0.67.70 500
            500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
            500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
         5.4.0.26.32 500
            500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
    That one gives nothing:
    Code:
    mkuemmel@bruce-2:~$ ubuntu-drivers list-oem
    mkuemmel@bruce-2:~$
    One bit of information, the last two successful boots were both with the USB-C cable of the docking station plugged in. There might be something in it and I can make some tests to see whether this is significant.

  4. #4
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    Xubuntu 20.04 Focal Fossa

    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Try installing the older 5.4.0-67 kernel, boot to it from grub and see if that helps as kansasnoob suspects it might.

    I don't think there is any problem installingbthat older kernel even though you must now have linux-generic-20.04-hwe installed in order to get those 5.8.0 kernels.

    I have never used the hwe system for any of my LTS installs so I'm not certain about these kernel version additions when moving back to older series but see what happens and then come back again.

  5. #5
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    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    So the sequence of events was:
    1. I install a 5.4.0-67 kernel as suggested;
    2. I boot into that kernel, it works! Happy, but other things (dockingstation, internet, ...) don't, which maybe was to be expected.
    3. I boot into 5.8.0-45 just for fun, it works! Interesting.
    4. I boot several times into 5.8.0-45 with/without USB keyboard with/without dockingstation, it always works!
    5. I boot into 5.4.0-67, it does not work.



    At the end ~half of the boots into 5.4.0-67 do work, and most/all of the 5.8.0-45 boots work when they happen after after a 5.4.0-67. Should I go back to 5.4.0-67? I guess I would have to adjust many other packages (which of course is doable). Or get used to boot into 5.4.0-67 and then go for 5.8.0-45 afterwards?

  6. #6
    Join Date
    Jul 2005
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    Xubuntu 20.04 Focal Fossa

    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    How very strange, and I'm afraid I have no idea where to suggest you go, or what to try from here on.

    Perhaps others will have more ideas; I certainly hope so!

  7. #7
    Join Date
    Sep 2014
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    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Okay while waiting for (hopefully) many other ideas, what's the strange part:
    • that 5.4.0-67 is not fully functional;
    • that 5.4.0-67 does not always boot;
    • that 5.8.0-45 boots after a 5.4.0-67 boot?

    Just curious.

  8. #8
    Join Date
    Jul 2005
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    Xubuntu 20.04 Focal Fossa

    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Can you check that you have all the packages that normally are installed with the linux-image packages, ie, the linux-headers, linux-modules packages of the exact same version as the linux-image package. If they're missing install them and see if that makes any difference.

    Linux-modules are a dependency of the linux-image so should be installed already but linux-headers are merely suggested packages so could be missing.
    I honestly do not have any idea if that will make any difference to your problem but it is easy enough to install if missing so worth doing.

  9. #9
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    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Quote Originally Posted by Martin_Kuemmel View Post
    So the sequence of events was:
    1. I install a 5.4.0-67 kernel as suggested;
    2. I boot into that kernel, it works! Happy, but other things (dockingstation, internet, ...) don't, which maybe was to be expected.
    3. I boot into 5.8.0-45 just for fun, it works! Interesting.
    4. I boot several times into 5.8.0-45 with/without USB keyboard with/without dockingstation, it always works!
    5. I boot into 5.4.0-67, it does not work.



    At the end ~half of the boots into 5.4.0-67 do work, and most/all of the 5.8.0-45 boots work when they happen after after a 5.4.0-67. Should I go back to 5.4.0-67? I guess I would have to adjust many other packages (which of course is doable). Or get used to boot into 5.4.0-67 and then go for 5.8.0-45 afterwards?
    What method did you use to install the 5.4 series kernel? The proper way would have been:

    Code:
    sudo apt install --install-recommends linux-generic
    If already installed may help to run:

    Code:
    sudo apt-get reinstall --install-recommends linux-generic
    Sometimes if just using "apt" fails the old "apt-get" command sorts things out.

    This may be helpful:

    https://wiki.ubuntu.com/Kernel/LTSEn...tStack#Desktop

    Even though nVidia may not be in play I'd still check for drivers using:

    Code:
    ubuntu-drivers list
    That may display what wifi drivers are needed?

    I'm uncertain about the docking station but let's do one thing at a time. Just happened to think - if not already doing so begin with:

    Code:
    sudo apt update
    Code:
    sudo apt dist-upgrade
    We may also be able to spot any missing parts by running:

    Code:
    sudo apt-get -f install
    Pay close attention though - under some circumstances that may recommend removing stuff we don't want to remove!

  10. #10
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    Re: Problems Booting 20.04.4 on a Dell Latitude 7400

    Just thought to add - a reboot is needed after every change. For example if you're missing any "modules" for the 5.4 series 'linux-generic' kernel they won't load after installation until you reboot. If no progress after trying the above post the output of:

    Code:
    dpkg --list | grep 5.4.0-67

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