You don't need to reformat when you install a GNU/Linux system, unless obviously there were filesystem issues or you're not happy with the partitioning scheme. When I do a clean install I just boot a live environment, mount the filesystem, rename the home directory to home.old, delete everything else from the root partition (and boot partition), and install without checking to format the partition for root. If you're not distro-hopping one partition should suffice, and if you use encryption 2. I use 3, for /boot, for LUKS_/ and for image files (.iso) so I'll won't need to boot from CD or USB when I need so.

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