This might also depend on how you put Lubuntu on your system. By default, I don’t think Lubuntu will create swap for you unless you specify during install via the manual partition setup.
Please see the following resources for guidance/clarity:
Hibernation (suspend-to-disk) The hibernation feature (suspend-to-disk) writes out the contents of RAM to the swap partition before turning off the machine. Therefore, your swap partition should be at least as big as your RAM size.
What is mentioned for Lubuntu probably still applies and should still be applicable for current releases.