The laptop is https://www.dell.com/en-us/shop/dell-laptops/new-inspiron-14-5000-laptop/spd/inspiron-14-5493-laptop
The problem is very similar to the one reported here: Install Ubuntu on Dell Inspiron 14 7490
The laptop has an 512 GB SSD but it is split into 2 RAID-0 partitions. I can start the Ubuntu installation program on a USB but it does not see any HD.
At the moment I cannot even boot the laptop with a USB drive. I need to start Windows 10, go to advanced boot options and restart using USB there. Thus I'm afraid that if I mess up somewhere, the laptop won't boot at all.