After upgrade to upstream KDE version this is fixed.
Kubuntu 16.04 x64 / KDE Plasma 5.6.3 / KDE Frameworks 5.21.0 / QT 5.5.1
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https://bugs.launchpad.net/bugs/1581371
Title:
Plasma
** Description changed:
The xenial proposed updates to network manger are crashing the plasma
networks app.
The following packages were updated that are causing the crash:
libkf5networkmanagerqt6 (5.18.0-0ubuntu1) to 5.18.0-0ubuntu1.2
libnm-glib4 (1.2.0-0ubuntu0.16.04.1) to
