So, in the last few weeks I updated an old Kubuntu 14.04 desktop installation (which has seen little or no use in the last few years) up to 16.04. Now kwin dies as soon as I login and I open any window. The underlying reason is probably some badly updated package or config file. Still, attaching the debugger I can see kwin segfaulting inside the Qt Javascript interpreter. I have no idea why a window manager would need to run a javascript interpreter nor why it would be a good idea.<p>Bottom line, tonight I&#x27;m installing Debian testing and switching to Xfce (which I have been using for years on my latptop).