few minutes after new start of pc every function slows down, online as well as offline / package linux-image-extra-4.4.0-64-generic 4.4.0-64.85 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1

[Ingo D. Eilers]

1) Release: UBUNTU 16.04.3 LTS , release: 16.04

2) Version of the package:
N: Datei "mono" in Verzeichnis "etc/apt/sources.list.d" wird ignoriert, da sie keine Dateinamen-Erweiterung hat.
N: Paket pkgname kann nicht gefunden werden.

3) My expectation: Normal speed of all Ubuntu functions.

4) Instead: Few minutes after every new start of pc every function slows down, online as well as offline.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-extra-4.4.0-64-generic 4.4.0-64.85
ProcVersionSignature: Ubuntu 4.4.0-96.119-generic 4.4.83
Uname: Linux 4.4.0-96-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: swami 1424 F.... pulseaudio
Date: Sat Oct 7 23:21:36 2017
ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
HibernationDevice: RESUME=UUID=50f940a4-4706-4749-ac2f-82774f6126fc
InstallationDate: Installed on 2017-01-24 (256 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: Dell Inc. Latitude E6500
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-96-generic root=UUID=3f09c27e-7004-45ce-b32b-474216b0c612 ro 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~beta2-36ubuntu3.12
SourcePackage: initramfs-tools
Title: package linux-image-extra-4.4.0-64-generic 4.4.0-64.85 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/18/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/18/2008:svnDellInc.:pnLatitudeE6500:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E6500
dmi.sys.vendor: Dell Inc.