I had the same today, dist-upgrade to linux-headers-4.15.0-34 resulted in the same error as above.
sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: linux-image-4.15.0-32-generic linux-modules-4.15.0-32-generic linux-modules-extra-4.15.0-32-generic Use 'sudo apt autoremove' to remove them. 0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up shim-signed (1.37~18.04.1+15+1533136590.3beb971-0ubuntu1) ... Installing for x86_64-efi platform. Could not prepare Boot variable: No space left on device grub-install: error: efibootmgr failed to register the boot entry: Input/output error. dpkg: error processing package shim-signed (--configure): installed shim-signed package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: shim-signed E: Sub-process /usr/bin/dpkg returned an error code (1) Never had this before and no firmware / BIOS changes. It's a dual-boot system with Win10. ------------------ sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: linux-image-4.15.0-32-generic linux-modules-4.15.0-32-generic linux-modules-extra-4.15.0-32-generic Use 'sudo apt autoremove' to remove them. 0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up shim-signed (1.37~18.04.1+15+1533136590.3beb971-0ubuntu1) ... Installing for x86_64-efi platform. Could not prepare Boot variable: No space left on device grub-install: error: efibootmgr failed to register the boot entry: Input/output error. dpkg: error processing package shim-signed (--configure): installed shim-signed package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: shim-signed E: Sub-process /usr/bin/dpkg returned an error code (1) --------------------- sudo efibootmgr -v -c -L ubuntu -l \\EFI\\ubuntu\\shimx64.efi Could not prepare Boot variable: No space left on device -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1776271 Title: Could not prepare Boot variable: No space left on device (package shim-signed 1.34.9+13-0ubuntu2 [origin: Ubuntu] failed to install/upgrade: Unterprozess installed shim-signed package post- installation script gab den Fehler-Ausgangsstatus 1 zurück) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1776271/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
