My fault, I copied the cryptsetup command-line option "--allow-discards"
into crypttab, instead of using the "discard" option as per "man
crypttab".

Interesting that despite the faulty option discard support was
automatically enabled, despite the strong security warning about using
"--allow-discards"  in "man cryptsetup".

** Changed in: cryptsetup (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1491150

Title:
  15.10: No SSD TRIM (allow-discards) support in update-initramfs

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