No suspend option in UI on Bionic Beaver [duplicate]
There is no suspend option in desktop 18.04. The only way I found is to go to Settings > power options and to set it to suspend when pressing the start button.
It works but I need to log in every time and it's painfully slow to open up.
Open the status menu (upper right corner) and hold alt, the shutdown button will turn into a suspend button as long as you're pressing alt (or long press with the left mouse on the shutdown button and it will turn in to a suspend button). There are also extensions that provide both buttons at the same time without requiring this extra step.