390.138 nvidia-settings: nvidia mode not working

[Raúl Hernández]

nvidia-settings is not loading the nvidia driver properly. I'm left with PRIME Profiles option only, and games that need this nvidia profile can't work any more

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$ lsb_release -rd
Description: Ubuntu 18.04.4 LTS
Release: 18.04

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$ apt-cache policy nvidia-driver-390
nvidia-driver-390:
  Instalados: 390.138-0ubuntu0.18.04.1
  Candidato: 390.138-0ubuntu0.18.04.1
  Tabla de versión:
 *** 390.138-0ubuntu0.18.04.1 500
        500 http://es.archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 Packages
        500 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 Packages
        100 /var/lib/dpkg/status
     390.48-0ubuntu3 500
        500 http://es.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages