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    #1

    SDDM wont start [black screen on startup]

    Hi

    I have Kubuntu 16.10 and startup gives black screen - login manager (sddm) does not start.

    sddm: Cannot mix incompatible Qt library (version 0x50501) with this library (version 0x50601)

    Can anyone help?

    Here is some log files
    kern.log http://paste.ubuntu.com/23542132/
    Xorg.0.log http://paste.ubuntu.com/23542137/
    journalctl     http://paste.ubuntu.com/23542483/

    As I understand when login manager is missing then user should be able to start X (or kde) from command line also. But 'startkde' or 'startx' both fail.
    startkde complaining that: $DISPLAY is not set or cannot connect to the X server
    startx: xf86EnableIOPorts: failed to set IOPL for I/O (operation not permitted)
    xinit: connection to X server lost

    I would not like to reinstall the whole system
    Tags: None
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    #2
    At the moment I can use lightdm as login manager and lxde desktop, but none of qt applications actually can run - all give the same error msg: Cannot mix incompatible Qt library (version 0x50501) with this library (version 0x50601)
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      #3
      How did you get your 16.10 system? Was it an 'upgrade' from an earlier existing system, and if 'yes', which system and version?

      What you are describing isn't something that would be seen if this installation were 'fresh'; installed from a LiveDVD/USB onto a 'clean' (no existing Linux OS) HDD.
      Using Kubuntu Linux since March 23, 2007
      "It is a capital mistake to theorize before one has data." - Sherlock Holmes​
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        #4
        I guess I upgraded from 16.04 a while ago (cant remember exactly when), repositories list shows previous version (16.04) repositories:

        # deb cdrom:[Kubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main multiverse restricted universe

        # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
        # newer versions of the distribution.
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety main restricted
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial main restricted

        ## Major bug fix updates produced after the final release of the
        ## distribution.
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety-updates main restricted
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

        ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
        ## team, and may not be under a free licence. Please satisfy yourself as to
        ## your rights to use the software. Also, please note that software in
        ## universe WILL NOT receive any review or updates from the Ubuntu security
        ## team.
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety universe
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial universe
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety-updates universe
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial-updates universe

        ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
        ## team, and may not be under a free licence. Please satisfy yourself as to
        ## your rights to use the software. Also, please note that software in
        ## multiverse WILL NOT receive any review or updates from the Ubuntu
        ## security team.
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety multiverse
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial multiverse
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety-updates multiverse
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial-updates multiverse

        ## N.B. software from this repository may not have been tested as
        ## extensively as that contained in the main release, although it includes
        ## newer versions of some applications which may provide useful features.
        ## Also, please note that software in backports WILL NOT receive any review
        ## or updates from the Ubuntu security team.
        deb http://ee.archive.ubuntu.com/ubuntu/ yakkety-backports main restricted universe multiverse
        # deb-src http://ee.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

        ## Uncomment the following two lines to add software from Canonical's
        ## 'partner' repository.
        ## This software is not part of Ubuntu, but is offered by Canonical and the
        ## respective vendors as a service to Ubuntu users.
        deb http://archive.canonical.com/ubuntu yakkety partner
        # deb-src http://archive.canonical.com/ubuntu xenial partner

        deb http://security.ubuntu.com/ubuntu yakkety-security main restricted
        # deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
        deb http://security.ubuntu.com/ubuntu yakkety-security universe
        # deb-src http://security.ubuntu.com/ubuntu xenial-security universe
        deb http://security.ubuntu.com/ubuntu yakkety-security multiverse
        # deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse
        # deb https://packagecloud.io/andris9/pangalink-net/ubuntu/ trusty main
        # deb-src https://packagecloud.io/andris9/pangalink-net/ubuntu/ trusty main
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          #5
          That's your /etc/apt/sources.list. I suspect you may have third-party repositories in /etc/apt/sources.list.d. Will need to see those as well.
          Using Kubuntu Linux since March 23, 2007
          "It is a capital mistake to theorize before one has data." - Sherlock Holmes​
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            #6
            What does the output of

            Code:
            apt list --installed *qt* | grep 5\.5
            show?
            On #kubuntu-devel & #kubuntu on libera.chat - IRC Nick: RikMills - Launchpad ID: click
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              #7
              /etc/apt/sources.list.d contains files:
              Code:
              google-chrome.list  google-chrome.list.distUpgrade  google-chrome.list.save  ria-repository.list  ria-repository.list.distUpgrade
              Only one contains uncommented code, google-chrome.list.save:
              Code:
              ### THIS FILE IS AUTOMATICALLY CONFIGURED ###
# You may comment out this entry, but any other modifications may be lost.
deb [arch=amd64] [URL]http://dl.google.com/linux/chrome/deb/[/URL] stable main
              output of 'apt list --installed *qt* | grep 5\.5':
              Code:
              WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
              output of 'apt list --installed *qt*':
              Code:
              Listing...
libqt5core5a/yakkety,now 5.6.1+dfsg-3ubuntu6~4 amd64 [installed]
              Last edited by v6mmal; Dec 05, 2016, 12:52 AM. Reason: formatting
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