Hey, that is most likely due to the default launch script using KVM for acceleration, you might not have KVM(And the required kernel modules) installed. You can however just turn off KVM acceleration in the launch.sh script, the game still should run, but eithout hardware virtualization support(Might be slow).
Edit: It also seems like qemu can't find the firmware for the network card that is included by default. You could try again by cloning this repo: https://github.com/max1220/lgj2019 and using the launch.sh script, that does not use network or KVM.