package linux-image-generic 4.3.0.5.6 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2

[Benjamin Drung]

It happened on the dist-upgrade from Ubuntu 15.10 (wily) to 16.04 (xenial)

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-generic 4.3.0.5.6
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.3-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: bdrung 1781 F.... pulseaudio
Date: Sat Jan 9 20:26:24 2016
ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
InstallationDate: Installed on 2015-09-07 (123 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 2333B15
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-5-generic root=UUID=7bed6617-9bb9-49ed-b2bb-32e9c3251e95 ro noprompt quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions: grub-pc 2.02~beta2-32ubuntu1
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: initramfs-tools
Title: package linux-image-generic 4.3.0.5.6 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
UpgradeStatus: Upgraded to xenial on 2016-01-09 (0 days ago)
dmi.bios.date: 04/09/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ETA4WW (2.64 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2333B15
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: R9YHZNA
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrG2ETA4WW(2.64):bd04/09/2015:svnLENOVO:pn2333B15:pvrThinkPadX230:rvnLENOVO:rn2333B15:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2333B15
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO