Here are futher observations:

Using a USB device interferes with suspend/hibernation. When something is 
plugged in my USB ports, suspend/hibernation seems to always fail (everytime I 
tried it so far with USB device plugged in). The I have to 'sudo 
update-initramfs -u' again, reboot once, and then suspend/hibernation works 
again.
After I just plugged in a USB device, and unplugged it right away, and tried 
suspend, computer did not go in a complete sleep mode, but instead only after a 
few seconds the computer immediately came back from suspend.

Even when I hibernate successfully, at the beginning of the hibernation
process, I see a fleeting error message (most of the time, maybe every
time?) about PCI...something failing to thaw. But otherwise everyhting
seems to work as expected.

The two executions of 'sudo update-initramfs -u' that I wrote about
before, were not meant for two different kernel version, but it was the
identical repetiotion of the same commad for the same kernel. I am not
sure whether one really needs to run it twice every time, but I was
suprise to see, that the size of initrd.img produced for the same kernel
by consecutive runs of 'sudo update-initramfs -u' always changes between
runs by a few bytes (up to a hundred bytes or so). Actually so far I did
it only three times consecutively at most ...

-- 
suspend/hibernate stopped working after abrupt shutdown
https://bugs.launchpad.net/bugs/311954
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