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35a32c5
(Get the code!)
ad #3 (continued):
attempt to de - install kernel 4.15.0-21: not possible to de - install the image 4.15.0-21!
Removed the .postrm and .generic.list files, related to this kernel, in /var/lib/dpkg/info/ in order to be able to get "apt" working.
Found 4.15.0-20~16.04 (version april 25) in /xenial-proposed -> installed it -> wifi works -> three consecutive boots were successful -> other than 4.15.0-21, kernel 4.15.0-20~16.04 could be de -installed without any problems.