Segfault with KDE5 session under NX

[agenkin]

KDE5 session fails to start under FreeNX (backtrace included below). Seems that the same issue affects users of X2Go and possibly of other remote desktop solutions based on the NX libraries.

This bug has been reported with the KDE project, and there is a small patch availabe (comment 36 of the KDE bug).
https://bugs.kde.org/show_bug.cgi?id=353825

Would be nice if Ubuntu applied the patch to the supplied KDE 5 packages.

Application: KCMInit (kdeinit5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f3c10c80740 (LWP 35646))]

Thread 2 (Thread 0x7f3bfc232700 (LWP 35648)):
#0 0x00007f3c0f3c670d in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007f3c0ea94c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2 0x00007f3c0ea968d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3 0x00007f3bfe5b4889 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4 0x00007f3c0f7407be in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5 0x00007f3c0d1a26ba in start_thread (arg=0x7f3bfc232700) at pthread_create.c:333
#6 0x00007f3c0f3d23dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f3c10c80740 (LWP 35646)):
[KCrash Handler]
#6 0x00007f3bfe37553c in XIFreeDeviceInfo () from /usr/lib/x86_64-linux-gnu/libXi.so.6
#7 0x00007f3bf99a2a5f in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_input.so
#8 0x00007f3bf99a8ef1 in kcminit_mouse () from /usr/lib/x86_64-linux-gnu/qt5/plugins/kcm_input.so
#9 0x00007f3bfe66f9d0 in ?? () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kcminit_startup.so
#10 0x00007f3bfe6701f6 in ?? () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kcminit_startup.so
#11 0x00007f3bfe6709dd in ?? () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kcminit_startup.so
#12 0x00007f3bfe671b06 in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kcminit_startup.so
#13 0x00000000004085ec in ?? ()
#14 0x00000000004050d4 in main ()

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: plasma-desktop 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-32.36~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Tue Sep 5 12:50:48 2017
JournalErrors:

ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, no user)
 SHELL=/local/bin/bash
SourcePackage: plasma-desktop
UpgradeStatus: No upgrade log present (probably fresh install)