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How to do it

Preperations

You need to be in a rescue system or have the disk unmounted. That is non negotiable!
Also make a snapshot/backup of you system!

Resizing

    e2fsck -f /dev/sdXY resize2fs /dev/sdXY XG fdisk /dev/sdX

    In fdisk you need to:

      Delete the old partition (d) Recreate it (n)
        Use +XG to resize it to the GB amount you choose when using resize2fs Write it (w)

        Now you should have a working partition that is resized to the amount you wanted.

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