I'm sorry I didn't send this earlier, but I forgot about it to be honest. In general, I want to apologize myself for the bug report, as, well, it's not a bug.
During the installation, Debian adds an entry in the fstab file, which I forgot to remove. I'm sorry I didn't check this before reporting the bug. I hope I didn't waste (too much) of your time, Paretje
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