https://askubuntu.com/questions/1072618/could-not-prepare-boot-variable- no-space-left-on-device-grub-install-error-ef
Solved the issue for me by clearing out the dump files in /sys/firmware/efi/efivars (ubuntu 18) -- 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