After reinstalling Manjaro KDE, why is how can I "link" my OS partition with the regular files partition, so that `root` points to it?

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Okay, so after reading the article that you provided (thanks!) as well as this very similar question, I have to:

  • Mount /sda4 (my old partition) inside my home directory, as I’m the only user in my laptop.
  • Then, edit the entry in /etc/fstab where type is / (which is root), so that it points to the recently created mount point in home?

How do I avoid a duplicate home directory? And wouldn’t the second step remove the mount I just created?