virtualbox - Don't boot in GUI but just in command line

I followed a lot of different tutorials to install Android_x86 on VirtualBox (actually I want to install Android on a virtual machine, so if you have alternatives, I'm interested), I followed its step by step, but when the installation is completed : the GUI won't start... I just get this:

I find a solution here to edit the GRUB boot parameters. But the config I have doesn't match with theirs...

Here I have to change androidboot.hardware=android_x86 to androidboot.hardware=x86 but on my config I have androidboot.selinux=permissive

The ISO I downloaded is android-x86_64-8.1-r1.iso from here and the version of VirtualBox is 6.0.2 r128162 (Qt5.6.3)

If anybody can help me, thank in advance ! :D

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