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Thread: can't boot after download

  1. #1
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    Oct 2021
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    can't boot after download

    At home I took delivery of a pc with ubuntu installed. It was working fine, until the system said it wanted to download some more recent software. I agreed and went out. When I came back the system said it wanted to restart. I agreed. Alas that was the last thing the computer did. It came back to a black screen. After a while I cyceld the power, but the same result -- black screen. I came into work (where I am now) in the hope that I could find out what I can do.

  2. #2
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    Oct 2021
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    Re: can't boot after download

    Sorry, I'm new here, indeed to forums generally. How can I find "
    appropriate support sub-forum" ?


  3. #3
    Join Date
    Jul 2008
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    The Left Coast of the USA
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    Kubuntu

    Re: can't boot after download

    In the upper left corner, click on "Forum". This will display all the categories.

    This would be best in the General Help sub-forum, so I have moved it there.
    Please read The Forum Rules and The Forum Posting Guidelines

    A thing discovered and kept to oneself must be discovered time and again by others. A thing discovered and shared with others need be discovered only the once.
    This universe is crazy. I'm going back to my own.

  4. #4
    Join Date
    Jun 2010
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    London, England
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    Ubuntu Development Release

    Re: can't boot after download

    I assume that Ubuntu is the only operating system on that machine. I also assume that as you recently took delivery of the machine it has a UEFI motherboard and not a BIOS motherboard. You may not know it but there is a boot menu (Grub) that only appears naturally when there is more than one OS installed. To bring up this boot menu when only one OS is installed you need to press the ESC key perhaps several times when the manufacturers splash screen is showing.

    With BIOS, quickly press and hold the Shift key, which will bring up the GNU GRUB menu. (If you see the Ubuntu logo, you've missed the point where you can enter the GRUB menu.) With UEFI press (perhaps several times) the Escape key to get grub menu. Select the line which starts with "Advanced options".
    When the Grub menu appears select Advanced Options for Ubuntu. There you will see a list of Linux kernels. The first one on the list is the kernel you are at present booking and getting a black screen. There will certainly been another kernel listed as being recovery mode. Select that.

    When the recovery menu appears you have options. Resume will load Ubuntu using a low resolution open source video driver. Or, it may load to a black screen. If that happens select network. That will establish an internet connection. Then select Root - Drop to a root shell prompt. Then run at least these two commands.

    Code:
    apt update
    apt upgrade
    Pay attention to any error messages. They will be useful to us. If the error messages are about missing or broken packages you can also run these commands

    Code:
    apt --fix-missing update
    apt install -f
    When this is done type exit to get back to the recovery menu. And select Resume again. If things seem to be working fine a reboot should load Ubuntu with a high resolution video driver.

    Regards
    Last edited by grahammechanical; October 28th, 2021 at 12:00 AM.
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  5. #5
    Join Date
    Oct 2005
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    Lab, Slovakia
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    10,470

    Re: can't boot after download

    If you are very new to Linux, find a local Linux user group and go to a meeting to find someone that can fix it for you.

    In general, an update has to be earned. There has to be a good reason to do it. If a machine is working properly, then an update won’t make it better - it will either be the same (with a few minor security issues fixed), or worse (like in this case - unusable), after the update. YMMV…
    Last edited by HermanAB; October 30th, 2021 at 12:04 PM.

  6. #6
    Join Date
    Nov 2021
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    2

    Re: can't boot after download

    Hi

    Simple answer (for linux newbies): There may be multiple probable causes to your problem. It depends on many factors that you didn't cover. How did you created the linux partitions, how did you install Install Ubuntu? From LiveDVD? From LiveUSB? Manual or automatic? Does your PC have a BIOS or a UEFI? Is your partition table an MBR or GPT? Etc. I know all these questions scare you. It did to me too, a long time ago when i started learning linux.


    First, Windows will never recognize ANY other operating system. That's the Microsoft way. Or any other partition types except their own. Windows, bootloader (winboot) will never recognize any other bootloader.


    Secondly, Ubuntu (as well as other linuxes) will always recognize other operating systems like Windows and MacOS. Ubuntu's bootloader (GRUB or GRUB2) will always recognize winboot.


    Every operating system needs a bootloader - a small software that tells the PC hardware the identity of the operating system, how it works and how to load it into RAM memory. An installed operating system without a bootloader is useless, because it will never be recognized by the hardware.


    What happens when we install multiple OSes (each one with its' own bootloader) on the same PC? Well, one bootloader must rule them all. A single GRUB is sufficient for multiple linuxes. For a Windows + a linux PC, a winboot must be present and a GRUB too. Preferably on different partitions (because if one fails, at least you'll have the other still available). But the GRUB must be the ruler, because it recognizes any other bootloader, and winboot does not.


    How to make GRUB rule the world? First install Windows. Automatically. Don't erase/merge any partitions. Secondly install Ubuntu. During Ubuntu install process, it should recognize the Windows installation. Choose install Ubuntu along Windows option. When asking you where to install GRUB choose /sda. That means the root of your first hard-disk. Highest priority possible! Don't choose any /sda1, /sda2, etc, because that means installing GRUB in the root of the specified partition 1, 2 ,etc and may result in conflict with winboot, erase winboot or not superseding winboot.


    One last thing: Although it is sometimes possible to install Ubuntu to NTFS or FAT partitions, that is only advisable to advanced and expert linux users. Any typical linux (Ubuntu included) needs AT LEAST 2 partitions: a swap partition and an ext2/3/4 partition.The swap partition is always inaccessible, it acts as virtual RAM memory, the ext partition is where your Ubuntu will be installed. For adequate usage SWAP size should be = (1.5...2) x RAM size. EXT partition can be any size you want, but no less than minimum size recommended by Ubuntu.


    Tip: The Windows' Disk Management equivalent in Linux is called GParted. And you can use it before (as in liveCD) and after you install Ubuntu.
    For proper viewing of ALL partitions on your disk ALWAYS use GParted!! A had an unpleasant surprise with Win8: it automatically creates a recovery partition upon install that is not visible in Disk Management, but is recognised by GParted!

  7. #7
    Join Date
    Jun 2014
    Beans
    6,370

    Re: can't boot after download

    The OP hasn't been back for 4 weeks so I imagine s/he has either resolved the problem or moved on..

    The windows bootloader since vista is BCD, managed with bcdedit. Not sure what 'winboot' is unless the link below describes it, malware?

    https://www.bleepingcomputer.com/sta...exe-22457.html

    Also, it is generally not a good idea to have any Linux system on a windows filesystem partition such as vfat or ntfs. vfat (FAT32) partitions can and are used for UEFI partition and for 'live' systems and a Linux iso or extracted iso can be put on a partition of any filesystem (including ntfs) but an actual install to an ntfs/vfat filesystem is a bad idea. .

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