It's a little better now. There is no crash, but Ubuntu dock isn't working.
To see the favorite applications you have to click activities.

2018-04-04 14:43 GMT+02:00 Apport retracing service <
<email address hidden>>:

> *** This bug is a duplicate of bug 1724439 ***
>     https://bugs.launchpad.net/bugs/1724439
>
> Thank you for taking the time to report this crash and helping to make
> this software better.  This particular crash has already been reported
> and is a duplicate of bug #1724439, so is being marked as such.  Please
> look at the other bug report to see if there is any missing information
> that you can provide, or to see if there is a workaround for the bug.
> Additionally, any further discussion regarding the bug should occur in
> the other report.  Please continue to report any other bugs you may
> find.
>
> ** Attachment removed: "CoreDump.gz"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101234/+files/CoreDump.gz
>
> ** Attachment removed: "Disassembly.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101236/+files/Disassembly.txt
>
> ** Attachment removed: "ProcMaps.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101241/+files/ProcMaps.txt
>
> ** Attachment removed: "ProcStatus.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101242/+files/ProcStatus.txt
>
> ** Attachment removed: "Registers.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101243/+files/Registers.txt
>
> ** Attachment removed: "Stacktrace.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/
> 5101244/+files/Stacktrace.txt
>
> ** Attachment removed: "ThreadStacktrace.txt"
>    https://bugs.launchpad.net/bugs/1761149/+attachment/5101245/+files/
> ThreadStacktrace.txt
>
> ** This bug has been marked a duplicate of bug 1724439
>    gnome-shell crashed with SIGSEGV in meta_window_get_monitor() from
> ffi_call_unix64() from ffi_call() from gjs_invoke_c_function() from
> function_call()
>
> ** Information type changed from Private to Public
>
> ** Tags removed: need-amd64-retrace
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1761149
>
> Title:
>   gnome-shell crashed with SIGSEGV in meta_window_get_monitor()
>
> Status in gnome-shell package in Ubuntu:
>   New
>
> Bug description:
>   This crash happens always when I turn off and on the monitor.
>   According to information it is a duplicate of bug #1724439, but when I'm
> asked to report the bug, this bug number or my earlier reported bug isn't
> among the suggested bugs.
>
>   ProblemType: Crash
>   DistroRelease: Ubuntu 18.04
>   Package: gnome-shell 3.28.0-0ubuntu2
>   ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
>   Uname: Linux 4.15.0-13-generic x86_64
>   ApportVersion: 2.20.9-0ubuntu2
>   Architecture: amd64
>   CrashCounter: 1
>   CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
>   Date: Wed Apr  4 13:37:33 2018
>   DisplayManager: gdm3
>   ExecutablePath: /usr/bin/gnome-shell
>   InstallationDate: Installed on 2018-04-01 (2 days ago)
>   InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64
> (20180330)
>   ProcCmdline: /usr/bin/gnome-shell
>   SegvAnalysis:
>    Segfault happened at: 0x7f68c98ebc24 <meta_window_get_monitor+4>:
> mov    0x18(%rax),%eax
>    PC (0x7f68c98ebc24) ok
>    source "0x18(%rax)" (0x00000018) not located in a known VMA region
> (needed readable region)!
>    destination "%eax" ok
>   SegvReason: reading NULL VMA
>   Signal: 11
>   SourcePackage: gnome-shell
>   StacktraceTop:
>    meta_window_get_monitor () from /usr/lib/x86_64-linux-gnu/
> libmutter-2.so.0
>    ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
>    ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
>    ?? () from /usr/lib/libgjs.so.0
>    ?? () from /usr/lib/libgjs.so.0
>   Title: gnome-shell crashed with SIGSEGV in meta_window_get_monitor()
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+
> bug/1761149/+subscriptions
>



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