package linux-image-4.15.0-42-generic 4.15.0-42.45 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127

I haw a dell latitude d630 and the start-up proses is 5 min after upgrading to this ubuntu version.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-42-generic 4.15.0-42.45
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
NonfreeKernelModules: lkp_Ubuntu_4_15_0_39_42_generic_46
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gdm 1113 F.... pulseaudio
                      kjell 1892 F.... pulseaudio
Date: Sat Jan 12 12:22:57 2019
DuplicateSignature:
 package:linux-image-4.15.0-42-generic:4.15.0-42.45
 Setting up grub-pc (2.02-2ubuntu8.9) ...
 /var/lib/dpkg/info/grub-pc.config: 14: /etc/default/grub: ESC: not found
 dpkg: error processing package grub-pc (--configure):
  installed grub-pc package post-installation script subprocess returned error exit status 127
ErrorMessage: installed linux-image-4.15.0-42-generic package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2016-05-01 (985 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Dell Inc. Latitude D630
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic root=UUID=c00e298c-c98c-4a35-bbb9-d58b14d15155 ro quiet splash vt.handoff=1
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
Python3Details: /usr/bin/python3.6, Python 3.6.7, python3-minimal, 3.6.7-1~18.04
PythonDetails: N/A
RelatedPackageVersions: grub-pc 2.02-2ubuntu8.9
SourcePackage: linux-signed
Title: package linux-image-4.15.0-42-generic 4.15.0-42.45 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/01/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0KU184
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd11/01/2007:svnDellInc.:pnLatitudeD630:pvr:rvnDellInc.:rn0KU184:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude D630
dmi.sys.vendor: Dell Inc.