Thanks, the trace shows:
open("/boot/efi/EFI/ubuntu/mach_kernel", O_RDWR) = -1 ENOENT (No such file or
directory)
write(2, "grub-install: error:", 20) = 20
write(2, " ", 1) = 1
write(2, "Can't create file: No such file or directory", 44) = 44
I notice that your /boot/efi directory has a /boot/efi/EFI/Ubuntu
16.04.2 LTS/mach_kernel, but not a /boot/efi/EFI/ubuntu/mach_kernel
which is the directory that Ubuntu's GRUB expects to use.
If you copy /boot/efi/EFI/Ubuntu 16.04.2 LTS/mach_kernel to
/boot/efi/EFI/ubuntu/mach_kernel, does the package install then succeed?
Full disclosure, I have no idea at all if this might make your system
unbootable. A successful grub-install may overwrite the Apple-specific
EFI boot variables with something other than what the system expects.
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https://bugs.launchpad.net/bugs/1707832
Title:
package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
failed to install/upgrade: subprocess installed post-installation
script returned error exit status 1
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