Suspend and hibernation are both cursed features due to weird nonstandard ACPI fuckery and hardware devices that don't cleanly know how to bring itself back up.
this post was submitted on 05 Aug 2023
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I use swapfiles, which makes hibernation slightly more difficult than a partition. Depending on the filesystem there are even different steps (btrfs).
What do you mean by «support»? In my Debian install I created an encrypted partition + LVM and I can hibernate without issue. I believe Ubuntu has an install option for encryption, so I think it should also work.
Full hibernate? Hybrid with power might work, but if the battery dies the default way doesn't work.