Finally found a solution for this issue => you have to add the kernel
parameter "resume=UUID=<UUID_OF_SWAP_PARTITION>" to the
/etc/default/grub file: edit the file and afterwards sudo update-grub)
or use Grub Customizer.

1. Why the heck is this kernel parameter suddenly required in Ubuntu 18.04 ?
It was definitely not necessary in Ubuntu 16.10, 17.04, 17.10.  No, it wasn't, 
on 3 PCs !!!

2. Why the heck is this kernel parameter not set automatically if it is 
required ?
It should be definitely set automatically.  Would make everything easier for a 
simple user like me :-)

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  Ubuntu MATE Bionic Beaver alpha - Hibernate/Resume Failure - ASUS
  P8H67-M PRO

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