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The only linux specific thing I see in that backtrace is this:
QWindowSystemInterface::sendWindowSystemEvents(QFl ags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#32 0x00007fffe769a2cb in () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
libQt5XcbQpa.so is a front for a platform specific plugin (libqxcb.so)
Do you have multiple versions of Qt installed?
Do you have environment variables set that might point to incorrect Qt library plugins?
What script are you using to actually launch Sigil and does it properly set the QT_PLUGIN_PATH?
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