Ubuntu – Black Screen on Startup

boot

I've been running on Linux for only about a week now. But I just came back to my PC after using it last night and now it won't boot properly. When I try to boot it asks for my crypt password so I enter it, then it shows the Ubuntu loading bar, then it flicks to a black screen with white text for about 3 seconds that reads:

"Ubuntu 14.04.3 LTS bchastko-MS-7693 tty1

bchastko-MS-7693 login: "

Then that text disappears and leaves me with a black screen until I turn off my computer. Ctrl+alt+del does not work once I'm at this screen. I've tried Boot Repair but it had no effect. The URL is here: http://paste.ubuntu.com/12717798/. If someone could help me I'd really appreciate it.

Thanks in advace

Best Answer

here's your problem:

=================== blkid:
/dev/sda3: UUID="f18a769e-4f52-49ad-a38e-bab773834ad8" TYPE="crypto_LUKS"


mount: unknown filesystem type 'crypto_LUKS'
mount /dev/sda3 : Error code 32
mount -r /dev/sda3 /mnt/boot-sav/sda3
mount: unknown filesystem type 'crypto_LUKS'
mount -r /dev/sda3 : Error code 32

ermm...

at this point, you'll probably need to load up a live cd, and mount your lukscrypt partition there, with the decryption key.

you're going to need to use /dev/mapper for mounting sda3 in your fstab/mount commands.

At this point, I suspect, you're going to need to boot to a live Ubuntu CD, chroot the Ubuntu environment, mount all the partitions on all the drives, and run grub-update. This process should both recover the boot for Windows and Linux to the grub menu.

Try the following:

  1. Boot the Ubuntu LiveDVD
  2. Select the option Try Ubuntu

  3. Then try the following:

    sudo su -
mount /dev/sda3 /mnt
cryptsetup luksOpen /dev/sda3/ crypthome
mount /dev/mapper/crypthome /mnt

    At this point, you'll have mounted your encrypted LUKS partition to /mnt on the LiveDVD.

    I would advise saving everything from /mnt/home to external storage before continuing. Worst case, if this becomes too painful, you can start over and at least save any docs/pics/desktop/junk/etc you may have been working on.

  4. Now we're going to attempt to fix things... through a chroot

    mount --bind /dev /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt /bin/bash

    At this stage you'll be in your PC's native OS in a chroot environment, but we're far from clear of your problem: we're going to need to review things, so your input from here forward will greatly help.

  5. copy things that will help us diagnose, your pc should have internet access as well, if not you can place the following things on external storage and paste individually to http://paste.ubuntu.com/ passing the links back to this help topic.

    /etc/fstab
/dev/mapper/*
    • Please update on your progress and pain points. At the moment, it's hard to decypher just what went wrong
    • you're running full disk encryption and the mount point for dev/mapper doesn't appear to be properly set up, so boot is failing...
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