If shim-signed and grub-efi-amd64-signed packages fail to install at Ubuntu 18.04 installation, the system became unreliable.
But I found a workaround that works. I added a unused EFI partition with around 100 Mb. To be able to install Ubuntu 18.04 I needed to create such a partition. jgr@zoe:~$ sudo fdisk /dev/sda /dev/sda1 2048 194559 192512 94M Sistema EFI /dev/sda2 194560 250068991 249874432 119.2G Linux sistema de arquivos With this non useful partition, the packages were installed without errors. jgr@zoe:~$ dpkg -l shim-signed grub-efi-amd64-signed ii grub-efi-amd64-signed 1.93+2.02-2ubuntu8 amd64 GRand Unified Bootloader, version 2 (EFI-AMD64 version, signed) ii shim-signed 1.34.9+13-0ubuntu2 amd64 Secure Boot chain-loading bootloader (Microsoft-signed binary) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766313 Title: (non-UEFI) package shim-signed 1.33.1+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1766313/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
