I have this bug also in Disco...i can not update from update-manager if it is a 
kernel update...the window asking for credential fails to appear.
ERROR:root:Authentication canceled, changes have not been saved

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https://bugs.launchpad.net/bugs/1734095

Title:
  Software & Updates not showing authorization popup [gnome-shell[N]:
  pushModal: invocation of begin_modal failed]

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