The error in your log is:
Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/grub/x86_64-efi/core.efi': Operation
not permitted.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
This looks like filesystem corruption. What filesystem do you have
mounted at /boot? Please show the output of 'mount | grep /boot'.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1743264
Title:
failed during xubuntu upgrade from 17.04 to 17.10 package shim-signed
1.32+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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