OK, I think I progressed a bit:

SUPER STRANGELY, awaking from sleep crashes only when I close the lid.
My Dell latitude has Fn-sleep combo so I can suspend the laptop from the
jeyboard, and then I have no crash. I tried several times and it
repeatedly wakes up without problems.

BUT if I close the lid after the suspend (also when I suspend from the keyboard 
Fn combination), the laptop crashes when tries to wake. I can reproduce this. 
Googling around, I did not find any solution in linux, but several had the same 
problem in Windows: 
https://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/workstation-crashes-sometimes-when-lid-is-closed/2c3c38a7-dee7-4ee8-a233-a5031f59110c

Which microsoft suggest waking USB driver, perhaps it is Intel USB 3.0 driver.
I will update the BIOS and if the problem persists, I will open a new bug 
report.

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https://bugs.launchpad.net/bugs/1801743

Title:
  Suspend fails in Kubuntu 18.04 but works fine in Kubuntu 17.10

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