package friendly-recovery 0.2.31ubuntu1 failed to install/upgrade: el subproceso instalado el script post-installation devolvió el código de salida de error 127

[Samuel Sempere Domínguez]

Configurando friendly-recovery (0.2.31ubuntu1) ...
/usr/sbin/grub-mkconfig: 12: /etc/default/grub: 4: not found
dpkg: error al procesar el paquete friendly-recovery (--configure):
 el subproceso instalado el script post-installation devolvió el código de salida de error 127

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: friendly-recovery 0.2.31ubuntu1
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Sat Apr 28 10:56:43 2018
ErrorMessage: el subproceso instalado el script post-installation devolvió el código de salida de error 127
InstallationDate: Installed on 2018-03-03 (55 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.26
SourcePackage: friendly-recovery
Title: package friendly-recovery 0.2.31ubuntu1 failed to install/upgrade: el subproceso instalado el script post-installation devolvió el código de salida de error 127
UpgradeStatus: No upgrade log present (probably fresh install)

[Juhani Numminen (jsonic)]

The problem may be in your configuration file /etc/default/grub. Please attach it to this report.

[Launchpad Janitor (janitor)]

[Expired for friendly-recovery (Ubuntu) because there has been no activity for 60 days.]