Faulty Software Updater on 16.04

[Ralf Mardorf]

On Sat, 7 Oct 2017 23:14:47 +0200, Ralf Mardorf wrote:
>Open a terminal and run
>
>  firefox --safe-mode
>
>Does the issue still appear?
>
>If so run
>
>  pkill -9 firefox
>
>then
>
>  firefox --ProfileManager
>
>Create a new profile and run Firefox with the new profile.
>
>Report back what happens.

Also try creating a second new profile and then run this profile by

  firefox --no-remote

then create a third new profile and run

  firefox --private-window

What happens?