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sudo dpkg-reconfigure uswsusp
The hybrid sleep button is currently broken, but I can do it from the terminal with "sudo s2both", and maybe there's other commands that do the same thing. Hybrid sleep first writes a hibernation file to disk, then suspends to RAM. If the machine loses power in that sleep state, it would then later be able to resume from the hibernation file instead of RAM, and nothing would be lost. If no power outage occurs, it just quickly resumes from RAM.
Maybe we can get the hybrid sleep button working, since I ended up having it visible due to preserving my home during the MX 18 to 19 upgrade.