package linux-image-4.4.0-22-generic 4.4.0-22.39 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2

[Bruce Smith]

apt-get update
apt-get upgrade <---- No errors reported that I observed
shutdown -r now <----- worked OK
<error reporting dialog popped up>

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-22-generic 4.4.0-22.39
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: bruce 1866 F.... pulseaudio
Date: Sat May 7 16:34:19 2016
ErrorMessage: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
HibernationDevice: RESUME=UUID=3bcbcb26-5100-4193-a998-fdf1ad98cdec
InstallationDate: Installed on 2016-05-03 (3 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IwConfig:
 enp0s3 no wireless extensions.

 lo no wireless extensions.
Lsusb:
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
ProcFB: 0 vboxdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash
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
RfKill:

SourcePackage: initramfs-tools
Title: package linux-image-4.4.0-22-generic 4.4.0-22.39 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Benjamin Drung (bdrung)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The relevant dpkg terminal log says:

/usr/sbin/mkinitramfs: 156: /usr/sbin/mkinitramfs: Cannot fork
/usr/sbin/update-initramfs: 180: /usr/sbin/update-initramfs: Cannot fork

So the shell failed to fork subprocesses. This might be a bug in the shell or caused by a lack of free memory. According to Dmesg.txt this system has 2 GiB memory. So retry "sudo update-initramfs -u" after reboot.

I am closing this bug. Please reopen in case you can reproduce the failure. Feel free to continue to report any other bugs you may find.