The error in your log is:
> grub-install: error: attempt to install to encrypted disk without
cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file
`/etc/default/grub'..
However, this is being installed for UEFI, which means the target disk
must be an EFI System Partition and can't be encrypted. And this is an
upgrade, which means you previously had grub2-signed installed, and we
have not reduced the set of grub modules included in grub2-signed;
/neither/ the new /nor/ the old version of grub-efi-amd64-signed that
you had installed on your system has support for loading kernels from
encrypted partitions.
Did you reconfigure your system to use encryption after installation?
Did you manually install a version of grub with cryptodisk support, or
is your /boot partition not properly mounted? Please attach /etc/fstab
and the output of 'mount' from the affected system.
** Changed in: grub2-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1627584
Title:
package grub-efi-amd64-signed 1.66.3+2.02~beta2-36ubuntu3.3 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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