> Using installgui:
> Failed step: "choose and install software", right after xorg 
configuration.
> Failed GRUB installation. No /boot/grub created.
> GUI mode hangs after switching consoles.
Does this result in a screen flash after which you're sent back to the 
graphical installer?
  
There was no screen flash.
I switched from GUI to text console, to see, what could be problem to 
GRUB and came back to GUI. Installer has stopped to response from this 
moment. No keyboard inputs nor mouse events were possible.