Public bug reported:

Can we get the installer in the Alternate ISO to probe for an SSD device
(hdparm) and prompt the user if they want TRIM enabled?  To my
knowledge, this involves the following effective changes:

1. Add the 'discard' mount options for the LVM logical volume
(/etc/fstab).

2. Add the 'discard' parameter to the cryptdevice options to make LUKS
accept the discard behaviour of the LVM logical volume (/etc/crypttab).

** Affects: debian-installer (Ubuntu)
     Importance: Wishlist
         Status: New

** Changed in: debian-installer (Ubuntu)
   Importance: Undecided => Wishlist

** Description changed:

  Can we get the installer in the Alternate ISO to probe for an SSD device
  (hdparm) and prompt the user if they want TRIM enabled?  To my
  knowledge, this involves the following effective changes:
  
  1. Add the 'discard' mount options for the LVM logical volume
  (/etc/fstab).
  
  2. Add the 'discard' parameter to the cryptdevice options to make LUKS
- accept the discard behaviour of the LVM logical volume ( /etc/crypttab).
+ accept the discard behaviour of the LVM logical volume (/etc/crypttab).

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https://bugs.launchpad.net/bugs/988542

Title:
  TRIM support cannot be enabled during install

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