Your log shows:
grub-install: error: /usr/local/lib/grub/x86_64-efi/modinfo.sh doesn't exist.
Please specify --target or --directory.
So you have a version of grub installed under /usr/local that is not
part of Ubuntu. This is not a bug in Ubuntu, but with your local
overrides of grub which are wrong for your installed system.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1749986
Title:
package shim-signed 1.33.1~17.10.1+13-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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