I just installed Ubuntu Mate 18.04.2 in a new laptop (HP 15-da0xxx, i5-8250U, 8GB RAM, NVIDIA GeForce MX110).
For a couple of weeks, I had Linux Mint Cinnamon 19.2 (therefore, kernel 4.15.0-46); but as I am more used to Ubuntu Mate, I installed UM 18.04.2 (kernel 4.18.0-16).
The problem I have is that when I suspend the machine it doesn't really suspends, but logs out, so open unsaved documents are lost (which didn't happen with LM Cinnamon).
I just tried with my old Samsung laptop (UM 18.04.2, up to date, but no HWE, so kernel 4.15.0-46, 4 GB RAM, no graphics card) and it works as expected: after suspending the machine, I wake it up and the unsaved documents are there.
Thanks in advance for your help.
Axel