package initramfs-tools 0.103ubuntu4.11 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Bryan Nielsen]

attempting a do-release-upgrade

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: initramfs-tools 0.103ubuntu4.11
ProcVersionSignature: Ubuntu 3.2.0-126.169-generic 3.2.79
Uname: Linux 3.2.0-126-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.29
Architecture: amd64
Date: Thu Jun 14 15:02:24 2018
DuplicateSignature: package:initramfs-tools:0.103ubuntu4.11:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-01-23 (1968 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.8
 apt 1.0.1ubuntu2.18
SourcePackage: initramfs-tools
Title: package initramfs-tools 0.103ubuntu4.11 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to trusty on 2018-06-14 (0 days ago)

[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 apt terminal log says:

gzip: stdout: No space left on device
E: mkinitramfs failure cpio 141 gzip 1

So generating the initramfs fails because your /boot partition is full. Please cleanup your boot partition. Feel free to continue to report any other bugs you may find.