I think I found a solution to my “Hibernate / Resume from Hibernate” issue for Ubuntu (MATE) 18.04, but still testing… I’m so really excited , I could hug the entire world
The “magic” happened by setting the additional kernel parameter resume=UUID=UUID_OF_SWAP_PARTITION via Grub Customizer or via:
sudo pluma /etc/default/grub
and adding the “resume” parameter to this line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=UUID_OF_SWAP_PARTITION"
The special “resume” kernel parameter was not required for Ubuntu 16.10, 17.04, 17.10 ! Why is it required now ? Anyway, it doesn’t matter, as long as there is a way to make this work
I’ll be back with a detailed instruction set for Hibernate / Resume from Hibernate for Ubuntu (MATE) 18.04 (of course, my way).
Once again, thank you so much to the wonderful people making Ubuntu MATE such a lovely DE for my PCs.
Edit: See my solution step by step Hibernate / Resume from hibernation - Ubuntu (MATE) 18.04