Installation problem OpenMandrivaLx4.2 iso downloaded from a official website

If you post here at a minimum run the installer from Konsole like this:

$ pkexec calamares -d | tee /home/live/calamares-installation-log.txt

and attach the log file created in your post here. This is explained in more detail in that article.

Edit: Combine screen shots of what you do with partitioning step with that log if possible.

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