This error was returned as I tried upgrading to the Ubuntu 16.04 version
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: plymouth 0.9.2-3ubuntu13.2
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Date: Tue Oct 24 10:30:36 2017
DefaultPlymouth: /usr/share/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2017-10-19 (5 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Hewlett-Packard HP Pavilion dv5 Notebook PC
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-97-generic root=UUID=d7abbbf0-de81-4ac7-a570-1dbe88180f79 ro quiet splash vt.handoff=7
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-97-generic root=UUID=d7abbbf0-de81-4ac7-a570-1dbe88180f79 ro quiet splash vt.handoff=7
RelatedPackageVersions:
dpkg 1.18.4ubuntu1.2
apt 1.2.24
SourcePackage: plymouth
TextPlymouth: /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
Title: package plymouth 0.9.2-3ubuntu13.2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2017-10-24 (0 days ago)
dmi.bios.date: 09/02/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.0B
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3602
dmi.board.vendor: Quanta
dmi.board.version: 02.1B
dmi.chassis.type: 10
dmi.chassis.vendor: Quanta
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.0B:bd09/02/2008:svnHewlett-Packard:pnHPPaviliondv5NotebookPC:pvrF.0B:rvnQuanta:rn3602:rvr02.1B:cvnQuanta:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv5 Notebook PC
dmi.product.version: F.0B
dmi.sys.vendor: Hewlett-Packard
Status changed to 'Confirmed' because the bug affects multiple users.