package light-locker 1.7.0-2ubuntu1 failed to install/upgrade: problemas de dependência - deixando desconfigurado

[Weiller]

weiller@weiller-MS-7641:~$ lsb_release -rd
Description: Ubuntu 16.04.6 LTS
Release: 16.04
weiller@weiller-MS-7641:~$ apt-cache policy light-locker
light-locker:
  Installed: 1.7.0-2ubuntu1
  Candidate: 1.7.0-2ubuntu1
  Version Table:
 *** 1.7.0-2ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

I expected this to open the user window and password for me to enter. But this only appears a black screen without entering, forcing me to enter the terminal using CTRL + ALT + F1, entering with my user and password to after I authenticate, I enter with the "startx" command so that it initializes the system. I have already tried to install the latest version in order to have the hope of correcting this error but the problem continues, forcing me to go back to the version that is in the repository in order to avoid further problems and conflicts with other packages, if any.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: light-locker 1.7.0-2ubuntu1
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: Wed Feb 27 06:35:48 2019
ErrorMessage: problemas de dependência - deixando desconfigurado
InstallationDate: Installed on 2019-02-06 (20 days ago)
InstallationMedia: Xubuntu 16.04.5 LTS "Xenial Xerus" - Release amd64 (20180731)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.5
 apt 1.2.29ubuntu0.1
SourcePackage: light-locker
Title: package light-locker 1.7.0-2ubuntu1 failed to install/upgrade: problemas de dependência - deixando desconfigurado
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.xdg.autostart.light-locker.desktop: [deleted]