I believe I have solved my problem! After some research, I made the
following change:
--> Preferences --> Default Applications for LXSession --> Autostart
CHECKED the box for PolicyKit Authentication Agent
Closed and rebooted.
Now the software updater runs perfectly! Something apparently changed
in the way authentication is done/or unchecked PolicyKit during a prior
update. I don't remember doing anything in that area at all myself.
Hope this will be a clue to some resolution for others!
Running Trusty Tahr, last updated 21Mar2014
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https://bugs.launchpad.net/bugs/1202754
Title:
update-manager crashed with SystemExit in exit(): 0
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