Hello
Just for the case if somebody have same problem with booting to black screen or freezing with strange pictures of X11 directories which I mentioned here:
Here is my way to uninstall @joakim_s X11(simple desktop) until the installer will be fixed for Buster which helped me:
sudo apt-get -y remove lxde-core xserver-xorg xinit fbi libinput-dev xwit xdotool x11-utils xvkbd zenity xterm sudo apt-get remove lightdm
and just for sure (maybe not needed) rename or delete of directories:
/home/osmc/x11-start
/home/osmc/.config/lxsession
After next reboot the kodi is booting normally.
Jan