Solutions
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PerfectAnswer's post in Impossible to install on HP-t630 ThinClient? was marked as the answerThank you very much for your quick support. I had already read the documentation and followed it. However, the actual problem was somewhere else. I was able to activate virtualization in the bios, but apparently this was done in a way that was not compatible with unraid. I was able to install proxmox on the same machine without any problems, but also had difficulties with VMs. After a bios update I was able to install unraid and create a VM.
Regards
Bernd