Your log shows:
Found linux image: /boot/vmlinuz-4.10.0-28-generic
find: ‘/boot/efi/EFI/ubuntu/F-8"?>\n. <s’: Input/output error
find: ‘/boot/efi/EFI/ubuntu/OST_OS</.ret’: No such file or directory
find: ‘/boot/efi/EFI/ubuntu/nvocatio.nCo’: Input/output error
find: ‘/boot/efi/EFI/ubuntu/Flags>SO.S_A’: Input/output error
Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
This suggests that you have a corrupted EFI System Partition which you
will need to repair manually.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1718582
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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