software-updater crashes everytime after upgrading to Lubuntu 18.04

[Mark]

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.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1809657

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Mark (mago90)]

I ran update-manager in the terminal and made it crash as I mentioned, however no useful input was shown in terminal :/ any idea?