Public bug reported:

After 17.04, it's now recommended, and the default, to use a swapfile
instead of a swap partition. However, hibernation appears to be
completely incompatible/non-functional with this, resulting in
hibernation nolonger being possible at all.

It's possible to configure GRUB to use the swapfile, and suspend-to-swap
will succeed provided the resume_offset parameter is present. However
resume will never occur, regardless of how GRUB and initramfs are
configured, it just flat-out ignores resuming completely and nothing
gets logged about it.

** Affects: kernel-package (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1683578

Title:
  Hibernation regression due to removal of swap partition

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