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Thread: Ubuntu 19.04 frozen at start of reboot

  1. #1
    Join Date
    Feb 2011
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    Ubuntu 18.04 Bionic Beaver

    Ubuntu 19.04 frozen at start of reboot

    Hi all,
    I seem to have a back to front problem. I went to restart my PC today and its stuck at the purple screen with the red dots going by, it's been like that for 10 minutes. All "helpful" info relates to this problem occurring at startup and mostly after a fresh install, neither of which apply to me.

    Before opting to press and hold the power button, I happened to press f1 (which might be just as well) and see an error [FAILED] Failed unmounting /home

    Now I don't know what to do, if /home didn't unmount and I force a shutdown it's possible I could lose some stuff right? But is there any alternative available?

    Thanks

    P.S I can't select Linux distro when posting this thread from mobile

  2. #2
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    Re: Ubuntu 19.04 frozen at start of reboot

    Generally pressing and holding Ctrl+Alt and
    then PrintScr, R, E, I, S, U, B (Raising Elephants Is So Utterly Boring)
    should do a clean reboot.
    R gives back control of the keyboard, S issues a sync, E sends all processes but init the term signal, I sends all processes but init the kill signal, U mounts all filesystem ro to prevent a fsck at reboot, B reboots the system

    What brand/model system?
    What video card/chip?
    New install or older install & what recent changes?


    May be best to see details, use ppa version with your live installer (2nd option) or any working install, not older Boot-Repair ISO:
    Please copy & paste link to the Boot-info summary report ( do not post report), the auto fix sometimes can create more issues.
    https://help.ubuntu.com/community/Boot-Repair &
    https://sourceforge.net/p/boot-repair/home/Home/
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #3
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    Ubuntu 18.04 Bionic Beaver

    Re: Ubuntu 19.04 frozen at start of reboot

    I keep getting signed out every time I try to post...

    Do I try that at the purple screen or the black screen from f1?

    PC is Lenovo all in one,
    I don't know the graphics details off hand.
    Install a couple of weeks old, no recent changes.

    Come to think of it, I added vboxuser (I think it was called) to groups earlier today. Apart from that no other changes.
    Last edited by MibunoOokami; 1 Week Ago at 06:21 AM. Reason: Correction about recent changes

  4. #4
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    Ubuntu 18.04 Bionic Beaver

    Re: Ubuntu 19.04 frozen at start of reboot

    Quote Originally Posted by MibunoOokami View Post
    Do I try that at the purple screen or the black screen from f1?
    Since the purple screen is the one normally present I used that command there and it worked (great mnemonic BTW) and I followed the instructions for installing boot-repair. I didn't run it though, just created the summary which is at https://paste.ubuntu.com/p/RmsfVfFPqR/

    Miles of info in there, I hope it's helpful.

  5. #5
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    Re: Ubuntu 19.04 frozen at start of reboot

    You have UEFI hardware.

    You have Windows installed in UEFI boot mode.

    It looks like you have Ubuntu installed in UEFI boot mode and booted Ubuntu live installer in UEFI boot mode, but at some point installed Ubuntu in BIOS boot mode as you have a copy of grub in gpt's protective MBR and a bios_grub partition which is required for BIOS boot with grub on gpt drives. Since fstab shows mount of /boot/efi, it looks like currently in UEFI boot mode.

    Not sure if BIOS boot would work, but evenually UEFI & BIOS versions of grub get out of sync and then you have issues. You should only be booting in UEFI boot mode for all installs and always for live installer.

    Windows will turn fast start up back on with updates.
    Boot-Repair says this:
    Windows not detected by os-prober on sda3.

    Fast Start up off (always on hibernation), note that Windows turns this back on with updates
    http://ubuntuforums.org/showthread.p...2#post13488472
    http://www.tenforums.com/tutorials/4...dows-10-a.html
    http://www.tenforums.com/tutorials/2...dows-10-a.html

    You should be able to directly boot Windows from UEFI boot menu, and then turn fast start up off, so then you can boot Windows from grub menu.

    Looks like your model can be anything from Celeron to i7 Intel chip based.
    Post this:

    grep -E 'model|stepping' /proc/cpuinfo | sort -u
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #6
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    Re: Ubuntu 19.04 frozen at start of reboot

    Quote Originally Posted by oldfred View Post
    You have UEFI hardware. You have Windows installed in UEFI boot mode. It looks like you have Ubuntu installed in UEFI boot mode and booted Ubuntu live installer in UEFI boot mode, but at some point installed Ubuntu in BIOS boot mode as you have a copy of grub in gpt's protective MBR and a bios_grub partition which is required for BIOS boot with grub on gpt drives. Since fstab shows mount of /boot/efi, it looks like currently in UEFI boot mode. Not sure if BIOS boot would work, but evenually UEFI & BIOS versions of grub get out of sync and then you have issues. You should only be booting in UEFI boot mode for all installs and always for live installer.
    This goes back to when I first installed 18.04, I eventually was able to get that to boot in BIOS mode because UEFI would only boot Windows. When it came to installing 19.04 I had completely forgot the the process of getting it to boot via BIOS mode, however, with the exception of yesterday’s reboot failure, it has been working fine. I’ll most certainly look at fixing this, probably with another clean install, from what I understand 19.04 support will stop in January which means either going back to 18.04 LTS, or 19.10.
    Quote Originally Posted by oldfred View Post
    Windows will turn fast start up back on with updates. Boot-Repair says this: Windows not detected by os-prober on sda3. You should be able to directly boot Windows from UEFI boot menu, and then turn fast start up off, so then you can boot Windows from grub menu. Looks like your model can be anything from Celeron to i7 Intel chip based. Post this: grep -E 'model|stepping' /proc/cpuinfo | sort -u
    On the odd occasion that I use Windows, I don’t allow networking or updates, so this might not be an issue. In fact, I had completely forgotten I still had Windows until installing 19.04 and decided to leave it there “just in case”. Grep output
    Code:
    $ grep -E 'model|stepping' /proc/cpuinfo | sort -u model        : 112 
    model name    : AMD A6-9220 RADEON R4, 5 COMPUTE CORES 2C+3G 
    stepping    : 0
    Last edited by oldfred; 1 Week Ago at 11:38 PM. Reason: added lines to show output in code tags better

  7. #7
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    Re: Ubuntu 19.04 frozen at start of reboot

    When I looked on Internet, your model only mentioned Intel.
    But you have AMD, which then may have some different issues.

    Other than general issues, I have not kept track of AMD vs Intel issues for most systems.
    Not sure then what may be best to review.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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