Hello Attila. So the admins are using a Web interface to QEMU. Which one? What -vga option is it using?
Perhaps when in GRUB, press E to edit the linux boot command-line and append to it: nomodeset IIRC there had been discussions about QEMU Bochs graphics and such, but I can’t find them. > maybe the installer could be extended with something to start a > temporary shell to configure te network, without the need to switch > virtual consoles? I don’t understand this. Can others help? Regards, Florian