====== Enable automatic trim on SSDs ======

  - open /etc/fstab in a text editor
  - add **discard** the the options of ext4 filesystems
  - reboot

===== Example =====
<file config /etc/fstab>
..
UUID=63ffd006-4620-4200-a562-e2d8a60e7b53 /               ext4    discard,errors=remount-ro 0       1
..
</file>