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Installing Batocera
(aussie.zone)
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Have you tried using a partition manager like gparted to wipe the windows partions?
Another thing is Dell has been doing an awesome (/s) thing lately where they have their disks configured as raid by default on their laptops. Try going into the bios and make sure raid is disabled and the SSD is set to AHCI
Just confirming this being a thing; had to battle the same crap recently at work trying to install Ubuntu server onto Dell Optiplex's... also make sure SATA is set to AHCI and not RAID, as well as the boot options that someone already pointed out in another comment.