Thanks for following up. Do you know why /boot/efi is commented out?
Uncommenting this fstab entry and running 'sudo mount /boot/efi' should
be enough to fix your upgrade problem.
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The fstab has the /boot/efi commented-out.
/boot/efi/EFI exists.
** Attachment added: "fstab"
https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1687441/+attachment/4874278/+files/fstab
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1687441
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess
The error in your log is:
Setting up shim-signed (1.28+0.9+1474479173.6c180c6-1ubuntu1) ...
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
