So, my fault: It IS actually a kernel issue. I didn't install linux-
modules-extra-4.15.0-96-generic package when trying out Ubuntu 18.04
stock kernel on Ubuntu 20.04. After installing this package hcitool
lescan works flawlessly...

** Package changed: bluez (Ubuntu) => kernel-package (Ubuntu)

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https://bugs.launchpad.net/bugs/1870837

Title:
  hcitool lescan says 'Set scan parameters failed: Input/output error'

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