Rapsberry Pi 4 with Noobs & Rapsbian full installed. Was working perfectly, until I did an
apt-get dist-upgrade. Now (after reboot) it seems the window manager is broken or not launched : symptoms, mouse can not interact with windows (move, resize, close etc. no work). Keyboard actions are not affected (Alt+F4 closes a window, e.g.)
I am willing to restart from zero, using Noobs, which I verified is working and accessible at boot time. Noobs is seeing the Rasbian - Full as "installed" and it has a chek-mark besides it.
How am I supposed to tell Noobs to zap the installed OS, repartition the card as might be necessary, download the official Raspbian for my Pi and start all over ? Un-checking the mark of the "installed" OS did nothing, and I couldn't find a way to "remove" or "uninstall", whatever they might call it.