The error in your log is:
Setting up shim-signed (1.34.9+13-0ubuntu2) ...
Installing for x86_64-efi platform.
grub-install: error: /boot/efi doesn't look like an EFI partition.
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 1
You are running on a UEFI system. Why is your UEFI System Partition not
mounted at /boot/efi?
This automatically-generated bug report is unrelated to the problem you
mention with your wifi card not working. Please file a separate bug
report against the kernel for that issue.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1768858
Title:
/boot/efi not mounted
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