I've created a patch for scripts/GRUB_PC/10-setup

https://github.com/faiproject/fai-config/commit/bf90f3048f552f2dc1a0f50766646dff9f67aef9

This should fix the issue for new installations.

Mmm, I forgot the VM case. So this does not work yet on virtual machines.
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viele Grüße Thomas

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