I've pushed a ~test2 package to my ppa. Please test it once it's finished building. I've tested it here locally and it fixes things for me. Note that after installing the package you should log out and back in to restart X. When I tested, it appears that the qt crash can cause the master pointer button state to be left incorrect.
I've also attached a patch that applies against the current qt package and should fix the issue. Upon confirmation, the qt4-x11 package should be uploaded with this fix. ** Patch added: "Patch against qt4-x11 package to fix bug" https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/725959/+attachment/1881379/+files/qt-xi2.1-no-widget.patch ** Description changed: + Qt has new multitouch support in Ubuntu. The current multitouch patch + does not properly handle the case where there's a touch event but no + widget where the touch occurred. When this happens, the qt library + crashes the application. + + ===== + Original bug report: + Binary package hint: libqtgui4 Before finishing the boot process of the guest OS (Windows7 64bit), VirtualBox closes unexpectedly and the following error can be seen in syslog: VirtualBox[12482]: segfault at 0 ip 00007faa37287a63 sp 00007fff35f443e0 error 4 in libQtGui.so.4.7.1[7faa37055000+a51000] Ubunty Release: Description: Ubuntu Natty (development branch) Release: 11.04 (x64) -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to qt4-x11 in ubuntu. https://bugs.launchpad.net/bugs/725959 Title: libqt4 4:4.7.1-0ubuntu10, 11 and 12 produce segfault in VirtualBox (libqtgui4) -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs