Marking as Invalid because the release is EOL is not correct. Marking as Incomplete. Also, 18.04 is (at the time of writing) still in development, and you should expect some breakage. https://wiki.ubuntu.com/Bugs/Responses#Release_has_reached_End_of_Life_.28EOL.29
Reporter, is this still present on 17.10 or 16.04? ** Changed in: linux-signed (Ubuntu) Status: Invalid => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed in Ubuntu. https://bugs.launchpad.net/bugs/1691161 Title: package linux-signed-image-4.8.0-52-generic 4.8.0-52.55 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 Status in linux-signed package in Ubuntu: Incomplete Bug description: Not Provided ProblemType: Package DistroRelease: Ubuntu 16.10 Package: linux-signed-image-4.8.0-52-generic 4.8.0-52.55 ProcVersionSignature: Ubuntu 4.8.0-49.52-generic 4.8.17 Uname: Linux 4.8.0-49-generic x86_64 ApportVersion: 2.20.3-0ubuntu8.2 Architecture: amd64 Date: Tue May 16 12:03:34 2017 DuplicateSignature: package:linux-signed-image-4.8.0-52-generic:4.8.0-52.55 Setting up linux-signed-image-4.8.0-52-generic (4.8.0-52.55) ... cp: error writing '/boot/vmlinuz-4.8.0-52-generic.efi.signed': No space left on device dpkg: error processing package linux-signed-image-4.8.0-52-generic (--configure): subprocess installed post-installation script returned error exit status 1 ErrorMessage: subprocess installed post-installation script returned error exit status 1 InstallationDate: Installed on 2017-02-18 (86 days ago) InstallationMedia: Ubuntu-MATE 16.10 "Yakkety Yak" - Release amd64 (20161012.1) RelatedPackageVersions: dpkg 1.18.10ubuntu1.1 apt 1.3.5 SourcePackage: linux-signed Title: package linux-signed-image-4.8.0-52-generic 4.8.0-52.55 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1691161/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp