Hello Phillip.
I was able to solve the problem already, using the suggestion to generate an
EFI partition.
Many thanks for the feedback.
Best regards
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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1
Your disk is currently partitioned to boot in bios mode, but you booted
the installer in EFI mode. You either need to boot the installer in bios
mode, or partition the disk using GPT and set up an EFI system partition
to install in EFI mode. This will be done for you if you choose the "use
entire d