Because I removed Windows soon after purchase, no guarantee! After calling twice with support, I gave it up: I deleted all partitions, installed windows 10 and then Xubuntu 18.04 and then fatal error message. something with UEFI. Once again everything has been reinstalled, again fatal error. Search with google and found the solution: the bios is set to windows 10 and no other system is allowed. In the system settings of the bios is a hidden setting (criminal!) ‘Windows 7 or other operating system’, and boot mode must be on CSM and fast boot on disabled, after that and saved with F10 Xubuntu installed en no errors Thank you for your help&suggestions 
The system is now running great.
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