system: ubuntu 17.10, kernel 4.13.0-36, libreoffice 5.4.5.1 (german localization) hardware: kaby lake i5-7300HQ, Intel HD Graphics 630 Since I installed the new intel opencl driver stack (https://01.org/compute-runtime, https://github.com/intel/compute-runtime/blob/master/README.md) libreoffice crashes when opening an existing document. I can start libreoffice with an empty document, but it then crashes on trying to save. I started libreoffice from the console to possibly see an error message. It states "Couldn't open /usr/share/kde4/config/kdebug.areas". Opencl is installed properly, checked by clinfo. Ohter programs like darktable are using it and behaving well. My system hasn't changed recently apart from the installation of opencl. I searched the internet and found some information on problems with opencl and libreoffice, but not connected to the new driver stack. Seems like I'm an early adopter ;-) Deactivating opencl in libreoffice, deleting the whole user profile or starting as root makes no difference. Uninstalling opencl unfortunately doesn't help either, libreoffice still crashes.
New info: I just installed libreoffice 6.0.1 and everything is working again - problem solved for me!