The error in your log is:
grub-install: error: cannot open `/boot/efi/EFI/ubuntu/grubx64.efi':
Read-only file system.
Having /boot mounted read-only at package upgrade time is unsupported.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1647454
Title:
package shim-signed 1.19~14.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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