I think it fails to install the grub, from the UbiquitySyslog.txt attached:
---------------
Jan 29 20:22:36 lubuntu grub-installer: info: architecture: amd64/efi
Jan 29 20:22:37 lubuntu grub-installer: info: Identified partition label for 
/dev/sda2: gpt
Jan 29 20:22:37 lubuntu grub-installer: (Reading database ... 147131 files and 
directories currently installed.)
Jan 29 20:22:37 lubuntu grub-installer: Removing grub-gfxpayload-lists (0.7) ...
Jan 29 20:22:37 lubuntu grub-installer: Removing grub-pc 
(2.02~beta2-36ubuntu11) ...
Jan 29 20:22:37 lubuntu grub-installer: dpkg: error processing package grub-pc 
(--purge):
Jan 29 20:22:37 lubuntu grub-installer:  subprocess installed pre-removal 
script returned error exit status 10
Jan 29 20:22:37 lubuntu grub-installer: dpkg: dependency problems prevent 
removal of grub-pc-bin:
Jan 29 20:22:37 lubuntu grub-installer:  grub-pc depends on grub-pc-bin (= 
2.02~beta2-36ubuntu11).
Jan 29 20:22:37 lubuntu grub-installer: 
Jan 29 20:22:37 lubuntu grub-installer: dpkg: error processing package 
grub-pc-bin (--purge):
Jan 29 20:22:37 lubuntu grub-installer:  dependency problems - not removing
Jan 29 20:22:37 lubuntu grub-installer: Processing triggers for man-db 
(2.7.5-1) ...
Jan 29 20:22:38 lubuntu grub-installer: Errors were encountered while 
processing:
Jan 29 20:22:38 lubuntu grub-installer:  grub-pc
Jan 29 20:22:38 lubuntu grub-installer:  grub-pc-bin
--------
I've tried this on my pc and it goes straight through with no errors. 
Specifically :
    dpkg: warning: ignoring request to remove grub-pc-bin which isn't installed
    dpkg: warning: ignoring request to remove grub-pc which isn't installed
    dpkg: warning: ignoring request to remove grub-gfxpayload-list which isn't 
installed
which are the packages giving errors in your case.

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https://bugs.launchpad.net/bugs/1660190

Title:
  Lubuntu live EFI installer crashes before it finishes on a new fully
  factory resetted TRITON laptop, running UEFI by default. It just may
  be because my usb booted SD card with the live installer is slightly
  corrupt. I think I should try reburning it. No?

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