You have been subscribed to a public bug:

See here:
http://paste.ubuntu.com/16343869/

this is the relevant code from qsgthreadedrendererloop.cpp:

        if (!w->thread->gl) {
            w->thread->gl = new QOpenGLContext();
            if (qt_gl_global_share_context())
                w->thread->gl->setShareContext(qt_gl_global_share_context());
            w->thread->gl->setFormat(w->window->requestedFormat());
            w->thread->gl->setScreen(w->window->screen());
            if (!w->thread->gl->create()) {
                const bool isEs = w->thread->gl->isOpenGLES();
                delete w->thread->gl;
                w->thread->gl = 0;
                handleContextCreationFailure(w->window, isEs);
                return;
            }


Qt is creating a GL context object, but creation fails. In cleaning up, 
QtUbuntu crashes as it's tries to release an invalid context.

** Affects: qtubuntu (Ubuntu)
     Importance: Undecided
         Status: Confirmed

-- 
GLContext: if creating a context fails, deleting it causes crash
https://bugs.launchpad.net/bugs/1580118
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