You have been subscribed to a public bug:
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: linux (Ubuntu)
Importance: Undecided
Status: New
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Hibernation regression due to removal of swap partition
https://bugs.launchpad.net/bugs/1683578
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which is subscribed to linux in Ubuntu.
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