[Bug 1809657] [NEW] software-updater crashes everytime after upgrading to Lubuntu 18.04

Public bug reported:

I am running a virtualbox with Lubuntu 18.04. I upgraded to this version
from the previous LTS through the software-updater, and everything
worked fine, except for the software updater- Whenever I run it manually
to see if there are updates, or when it pop-out automatically and I
click, it crashes. I tried to run it from terminal to see if it showed
some error but I couldn't find a way to do so. Any help? If I run "sudo
apt-get upgrade" I can update the software without problem. I tried it
on another virtualbox with the same set-up (host Lubuntu 16.04.3 guest
Lubuntu 18.04) and the problems happens too.

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/1809657

Title:
software-updater crashes everytime after upgrading to Lubuntu 18.04

Status in linux package in Ubuntu:
New

Bug description:
I am running a virtualbox with Lubuntu 18.04. I upgraded to this
version from the previous LTS through the software-updater, and
everything worked fine, except for the software updater- Whenever I
run it manually to see if there are updates, or when it pop-out
automatically and I click, it crashes. I tried to run it from terminal
to see if it showed some error but I couldn't find a way to do so. Any
help? If I run "sudo apt-get upgrade" I can update the software
without problem. I tried it on another virtualbox with the same set-up
(host Lubuntu 16.04.3 guest Lubuntu 18.04) and the problems happens
too.

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