Public bug reported:

weiller@weiller-MS-7641:~$ lsb_release -rd
Description:    Ubuntu 16.04.6 LTS
Release:        16.04

weiller@weiller-MS-7641:~$ sudo apt-cache policy lightdm
lightdm:
  Installed: 1.18.1-0ubuntu1
  Candidate: 1.18.3-0ubuntu1.1
  Version table:
     1.18.3-0ubuntu1.1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
Packages
 *** 1.18.1-0ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

I expected it to update to the current version. But when I turn on the 
computer, I expect it to load and when it arrives the part that would be the 
appearance of the login screen, it simply does not start getting a black screen 
but nothing happens. For me to dribble this screen, I have to press the CTRL + 
ALT + F1, enter Terminal mode with my user and password to from there I enter 
with the command "Startx". When I start, it has been asking me for a password 
to reorto an error. I do not deny and report anyway. But this is making me 
intrigued because whenever I have to go into command mode (Terminal) to start 
the system and I use this way but I believe it is some previous update package 
because some updates came a couple of days ago and after these updates, LightDM 
started to give this problem. This has happened to me a few times but I have 
always reinstalled the system. But this time I decided to report the bug to a 
possible solution.
Just forgive me if the translation is not 100% because I write in Portuguese to 
translate with Google Translate and send it to you. I hope I can be helpful in 
reporting this error so that I can get a fix as soon as possible.
I know I have a current version in the repository. It has this 1.18 and has one 
in the unstable repository 1.28. But I already installed and with all 
dependencies but the problem has not been solved. If I knew to send an update 
log two days ago or three days ago, the modifications that were made, you would 
probably be able to solve the problem from there since it started from that 
update. I just do not update Xubuntu to version 18.04 because I'm afraid of 
appearing more bugs and as this version has a long support, I decided to keep 
on expiring and then, having better conditions, I do the Update.

I hope I have helped and anything I will be at your disposal. In the
meantime I will use the system this way while I await a solution coming
from you. Thank you very much.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-45.48~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Sat Feb 23 16:13:01 2019
ErrorMessage: sub-processo script post-installation instalado retornou estado 
de saída de erro 1
InstallationDate: Installed on 2019-02-06 (16 days ago)
InstallationMedia: Xubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
LightdmConfig:
 [Seat:*]
 autologin-guest=false
 autologin-user=weiller
 autologin-user-timeout=0
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.5
 apt  1.2.29ubuntu0.1
SourcePackage: lightdm
Title: package lightdm 1.18.1-0ubuntu1 failed to install/upgrade: sub-processo 
script post-installation instalado retornou estado de saída de erro 1
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
     Assignee: Weiller (weillerronfini)
         Status: New


** Tags: amd64 apport-package third-party-packages xenial

** Changed in: lightdm (Ubuntu)
     Assignee: (unassigned) => Weiller (weillerronfini)

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https://bugs.launchpad.net/bugs/1817431

Title:
  package lightdm 1.18.1-0ubuntu1 failed to install/upgrade: sub-
  processo script post-installation instalado retornou estado de saída
  de erro 1

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