@kp_auburn It may be during the update, something went awry with the Kernel update..
When booting.. On the grub screen - Choose the Advanced Options for Linux Lite..
You should see options options for various Kernels.. something like LL.. 4.15.0-159, 4.15.0-156, 4.15.0-154 etc etc...
The highest/top most is the kernel its attempting to boot with.
- try choosing the next kernel (non recovery) and see if you can boot.. if not then try the next and so on..
So if 159 is failing try 156 then 154 etc..
Once booted - you can use Lite Tweaks to remove the failing kernel (159)
- then reboot go back to the top level grub - which will now boot with working...
Then you can trying updating once again...