I had this issue as well when running anything dpkg related in the
terminal, the "blindly entering your password" trick did not work for
me, but I did find a fix.

Running the software updater completely fixed the issue. It actually
came with a popup for the password, which seems to be the missing link
that #4 is talking about, but pressing enter after adding passwords in
it did not work for me, I had to press next, which explains why typing
passwords and spamming enter did nothing.

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  package linux-image-4.15.0-22-generic 4.15.0-22.24 failed to
  install/upgrade: installed linux-image-4.15.0-22-generic package pre-
  removal script subprocess returned error exit status 1

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