For what it's worth, and I'm not sure if this is related... But I believe this package is failing to install because the efi partition it is looking for may not be found if secure boot is disabled? I have secure boot disabled on this laptop, which is required for proprietary nVidia drivers.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1741105 Title: package grub-efi-amd64-signed 1.66.15+2.02~beta2-36ubuntu3.15 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1741105/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
