Software updater claims not enough space on /boot to perform upgrades

[PrivateUser132781]

Running the software update utility on a default 14.04 installation with full-disc encryption enabled results in the error message "insufficient space on /boot to perform upgrades". However, the command-line utilities successfully perform the required upgrades

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: update-manager 1:0.196.12
ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
Uname: Linux 3.13.0-44-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Feb 3 10:57:02 2015
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'484'
 b'com.ubuntu.update-manager' b'launch-time' b'1422953736'
InstallationDate: Installed on 2014-09-09 (146 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: No upgrade log present (probably fresh install)

[PrivateUser132781 (privateuser132781-deactivatedaccount)]

Actually, in the past using aptitude to perform the upgrades after this message worked. This time it didn't until I manually removed some old kernals, presumably freeing up space on the boot partition.

[Launchpad Janitor (janitor)]

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