The bug contents clearly show that at the time the bug report was filed, /boot/efi was mounted. But equally clearly, the bug report shows that the grub package could not find the EFI directory at package upgrade time:
Installing for x86_64-efi platform. grub-install: error: cannot find EFI directory. Failed: grub-install --target=x86_64-efi --no-extra-removable WARNING: Bootloader is not properly installed, system may not be bootable Can you please attach /etc/fstab still? ** Summary changed: - (/boot/efi not mounted) package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 + package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 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/1725409 Title: package shim-signed 1.32+0.9+1474479173.6c180c6-1ubuntu1 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/1725409/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
