The error in your log is:
Setting up shim-signed (1.42+15+1552672080.a4a1fbe-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: cannot open `/boot/efi/EFI/ubuntu/grubx64.efi': Read-only
file system.
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
Your ESP (/boot/efi) must be mounted read-write at the time of upgrade.
This is how Ubuntu configures it by default.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1891231
Title:
partial upgrade followd by package shim-signed 1.42+15+1552672080
.a4a1fbe-0ubuntu2 failed to install/upgrade: installed shim-signed
package post-installation script subprocess returned error exit status
1
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