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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

  1. e2fsck -f /dev/sdXY
  2. resize2fs /dev/sdXY XG
  3. fdisk /dev/sdX

In fdisk you need to:

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

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

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