Hello, I have finally succeeded to swich from RST to AHCI (after trying very long in vain). The documentation was missing crucial information for my special case: I had to disable Intel Optane Memory Acceleration before restarting into safe mode and switching from RST to AHCI in Bios. Before that, diskpart did not find any volumes and so I could not proceed from there.
The necessary steps are described here (scroll down to the last comment): https://askubuntu.com/questions/1433786/install-ubuntu-as-dual-boot-deactivating-intel-rst-leads-to-disk-drive-not-dete
Please include into the documentation, that Intel Optane Memory needs to be disabled in case the computer’s hard disk has it enabled.
Further remark to be added in the documentation: Bitlocker seems to need to be disabled before the BIOS-step (not relevant for my computer, though).
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