@Yann what worked in the end was enabling legacy boot. The grub menu entries was misaligned, so I couldn’t select the OS but after some seconds the MATE desktop showed up and I played a bit with it. My network card was detected and I could connect to the network without issues, the system looks very stable for being in beta stage. In fact, there was no install script, so I assume it’s only a live OS. My question is: do you have (or plan on having) a handy package management tool like slapt-get/Gslapt which could upgrade the system, install single binary packages from the repos and handle dependencies?
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