To clarify:  it's a Logitech headset (with microphone) connected by USB
and a secondary display connected by HDMI.

The laptop boots normally until it reaches the login screen.  I enter my
password, the screen changes, blips, then I'm back at the login screen
again.  This cycle repeats as long as I'm willing to type in my password
and hit enter.

This last time I dropped to shell (ctrl-alt-f1) and removed lightdm.

I did fail to stop it, however, and that caused "post-removal script
returned error exit status 1" because it couldn't remove the user
'lightdm' (it was still in use in the other terminal).  This is related
to user error.

The real problem that created this scenario seems to exist somewhere
else.  For that problem, I was able to boot normally by removing the
HDMI jack and the USB jack from my laptop.

Dunno if any of that helps anyone, but I hope so.

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https://bugs.launchpad.net/bugs/1249407

Title:
  package lightdm 1.8.4-0ubuntu1 failed to install/upgrade: subprocess
  installed post-removal script returned error exit status 1

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