Upon closer examination, your report shows that the system *does* support UEFI: 'efibootmgr' returns a complete list of UEFI boot entries. But grub-install reports that it can't find the EFI directory, even though it had just used the same code to install grub-efi-amd64-signed moments before:
Setting up grub-efi-amd64 (2.02~beta2-36ubuntu3.1) ... Installing new version of config file /etc/kernel/postinst.d/zz-update-grub ... Installing new version of config file /etc/kernel/postrm.d/zz-update-grub ... Generating grub configuration file ... [...] Found Windows Boot Manager on /dev/sda1@/efi/Microsoft/Boot/bootmgfw.efi Adding boot menu entry for EFI firmware configuration done Setting up grub-efi-amd64-signed (1.66.1+2.02~beta2-36ubuntu3.1) ... [...] Setting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ... Installing for x86_64-efi platform. grub-install: error: cannot find EFI directory. dpkg: error processing package shim-signed (--configure): subprocess installed post-installation script returned error exit status 1 Can you show the output of 'mount' on this system, and a directory listing of /boot/efi? ** Summary changed: - package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 + grub-install: error: cannot find EFI directory: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 ** Summary changed: - grub-install: error: cannot find EFI directory: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 + (14.04->16.04 upgrade) grub-install: error: cannot find EFI directory: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1607817 Title: (14.04->16.04 upgrade) grub-install: error: cannot find EFI directory: package shim-signed 1.18~16.04.1+0.8-0ubuntu2 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/shim-signed/+bug/1607817/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
