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    • Deepin 15.5 Beta Black Blank Screen
    Community Discussion 1976 views · 9 replies ·
    Tofloor
    poster avatar
    lamasg
    deepin
    2017-11-26 23:27
    Author
    Edited by lamasg at 2017-11-26 15:30

    So, I have been using Deepin and its amzing.

    Yesterday, while testing on a QT project, I copied a file custom file libQt5Core.5.so (or something) into /usr/lib/x86_64-linux-gnu folder and the file manager crashed. So I restarted the PC just to enter the Black/Blank Screen.

    All the other options in Deepin Advanced Options (during bootup) also shows me Black Screen. I am locked out.

    Specs:
    Nvidia GT-730
    Intel i3 6100 (3.7GHz)
    MSI Motherboard
    Two Storage devices (SSD and HDD)

    Root file system on SSD and others on HDD, filesystem shown below
    / - SSD
    /usr/local - HDD
    /var - HDD
    /opt - HDD

    I tried to get into recovery mode and this is what I got
    Cannot open access to console, the root account is locked.

    How can I get my display back?



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    o4is
    deepin
    2017-11-27 00:11
    #1
    Have you checked those?
    https://bbs.deepin.org/post/146086#root%2Baccount%2Blocked
    https://bbs.deepin.org/post/37475#root%2Baccount%2Blocked
    https://bbs.deepin.org/post/138079#root%2Baccount%2Blocked
    https://lists.debian.org/debian-user/2009/05/msg01538.html
    Reply View the author
    lamasg
    deepin
    2017-11-27 00:37
    #2
    Thanks for the links. However, as a non sophisticated user, I am not sure how can I get back my desktop environment back since its all black right now.

    I was able to login one of the boot menu options but only in command line mode. I took all the backup from this mode atleast.

    I do not know where to go from here. I do not know where the problem is. Any lead in this matter is helpful.
    Reply View the author
    lamasg
    deepin
    2017-11-27 00:39
    #3
    ...... Is there a time machine like feature that can help me get into the working state?
    Reply View the author
    o4is
    deepin
    2017-11-27 00:59
    #4
    https://bbs.deepin.org/post/149004
    ...... Is there a time machine like feature that can help me get into the working state?

    The fist thing i would suggest for this problem and for future problems, is to create/have a livecd/liveusb.
    I have a small usb flash drive, with lubuntu installed on it and whenever there is a problem i boot from there and check my system.
    Try to make one, and boot from there. Enter the terminal and list all your disks:
    1. lsblk
    Copy the Code

    Check and fix any errors on the filesystems:
    1. sudo e2fsck -f -y /dev/sdXX
    Copy the Code

    where XX are the partions you have, e.g sudo e2fsck -f -y /dev/sda1 ,if thats your / partition.
    See what the output is. Try to boot then Deepin.

    Reply View the author
    lamasg
    deepin
    2017-11-27 01:14
    #5
    Thanks. Also let me dig into journalctl and see what went wrong.
    Reply View the author
    o4is
    deepin
    2017-11-27 01:19
    #6
    https://bbs.deepin.org/post/149004
    Thanks. Also let me dig into journalctl and see what went wrong.

    Yes, of course.
    Access your logs, and see what is happening during the boot.
    Reply View the author
    nipos
    deepin
    2017-11-27 02:17
    #7
    The problem is that you replaced a Qt file.
    Qt is needed by all Deepin applications which can't work anymore.
    You have to reinstall Qt to make it working again.
    sudo apt-get install --reinstall qt5-base
    Reply View the author
    eddybosstronpie
    deepin
    2017-11-27 08:59
    #8
    If none of the above work, don't worry, just reinstall the OS and it most likely won't happen again. Also if possible you could try to access the update area to see if the need for updating caused it (you might not be able to with a black screen). I had a different problem whereas the dock would not appear, I tried everything but then I found out my system needed to update then after I updated Deepin it fixed. So my guess is that the black screen is either caused by updates or it's caused by that custom QT file that you copied over.
    Reply View the author
    lamasg
    deepin
    2017-11-27 19:44
    #9
    Update: As I suspected and as user nipos said, copying qt file into the wrong place may be the cause of the problem . journalctl was overwhelming and I was not able to trace the root problem with it.

    So I ended up reinstalling the OS (much simpler this way, as Deepin installer is a breeze I must say). I am contemplating a permanent backup restore tool to deal with such situation for the future. However its a little trickier as WHAT EXACTLY to backup from '/' root. For now, I am backing up everything except certain directories, using restic.
    Reply View the author