Public bug reported: System was running fine then the desktop background went black. I continued to work for a while to tidy things up (open window were OK) and rebooted. Any attempt to login will produce a black screen shortly after the desktop is displayed.
The problem is related to this: [ 119.186969] plasmashell[2316]: segfault at 0 ip 00007f1517ee4556 sp 00007ffee1d19c30 error 4 in libkcupslib.so[7f1517ea8000+55000] This started shortly after midnight. The first one in kern.log is: May 9 00:08:46 parent kernel: [22487.658162] plasmashell[10497]: segfault at 0 ip 00007faf64cce556 sp 00007ffe0cbc0b60 error 4 in libkcupslib.so[7faf64c92000+55000] so I suspect this is something to do with anacron scripts. May 9 00:08:39 parent anacron[10182]: Job `cron.daily' started The only packages updated since yesterday are: root@parent:/local/configs/packages# diff installed.list.2018-0508 installed.list 448c448 < ii intel-microcode 3.20180312.0~ubuntu18.04.1 amd64 Processor microcode firmware for Intel CPUs --- > ii intel-microcode > 3.20180425.1~ubuntu0.18.04.1 amd64 Processor microcode > firmware for Intel CPUs 1112c1112 < ii libjavascriptcoregtk-4.0-18:amd64 2.20.1-1 amd64 JavaScript engine library from WebKitGTK+ --- > ii libjavascriptcoregtk-4.0-18:amd64 2.20.2-0ubuntu0.18.04.1 > amd64 JavaScript engine library from WebKitGTK+ 1827c1827 < ii libraw16:amd64 0.18.8-1 amd64 raw image decoder library --- > ii libraw16:amd64 0.18.8-1ubuntu0.1 > amd64 raw image decoder library 2073c2073 < ii libwebkit2gtk-4.0-37:amd64 2.20.1-1 amd64 Web content engine library for GTK+ --- > ii libwebkit2gtk-4.0-37:amd64 2.20.2-0ubuntu0.18.04.1 > amd64 Web content engine library for GTK+ 2717c2717 < ii update-notifier-common 3.192 all Files shared between update-notifier and other packages --- > ii update-notifier-common 3.192.1 > all Files shared between update-notifier and > other packages but I don't see it being any of them. The microcode update didn't actually change the firmware file for this system, and a reboot to the previous kernel had the same problem anyway. NOTE: that any attached system data is for the wrong system (correct Ubuntu release though). Since I have no desktop login on the affected system I can't run apport-bug there. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: plasma-workspace 4:5.12.4-0ubuntu3 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: KDE Date: Wed May 9 01:36:24 2018 InstallationDate: Installed on 2017-11-01 (188 days ago) InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1) SourcePackage: plasma-workspace UpgradeStatus: Upgraded to bionic on 2018-05-02 (7 days ago) ** Affects: plasma-workspace (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to plasma-workspace in Ubuntu. https://bugs.launchpad.net/bugs/1770044 Title: plasmashell crashes on login - so I can't use my desktop system. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1770044/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs