Two different PCs were upgraded from 16.04 to 18.04 (Lubuntu).

Bug is the same: auto-updater window pops up as it should, but after clicking „install“ it does not ask for the password, but quietly crashes.

sudo apt update + sudo apt upgrade seem to work properly.


I had the same problem, and was using command line to update Lubuntu. Today I decided to reinstall the Software Updater. Turned out, there is no package named "software-updater", so I used this command instead:

sudo apt install --reinstall update-manager

Then I started the Software Updater - it didn't crash, but requested reboot. After reboot I started the Software Updater - it didn't crash and showed "The software on this computer is up to date." Will test again in a couple of days.

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