[Evolution] Evo fails to connect to Gmail: “Failed to authenticate: The name :1.6 was not provided by any .service files"

[Len Philpot <lphilpot01 gmail com>]

Xubuntu 18.04.02
Evolution 3.28.5-0 (Help | About reports it as "3.28.5-0ubuntu0.18.04.1")

I realize this isn't the absolute newest version, but it's not that old and was working prior to the last group of updates. Honestly I don't recall if Evo changed or not, however. When I launch it I get this error for both Google mail accounts I'm accessing via IMAP:
    Failed to connect account “xxxxxxx gmail com”.
    The reported error was “Failed to authenticate: The name :1.6 was not provided by any .service files”.

I've seen this error before but not since 3.23 on Xubuntu 16.04 (which if I recall used a Gnome service for Google mail which is no longer the case?). I've stepped through the Google authentication process but the error persists. Apparently my Google-fu is weak today and searching has turned up nothing applicable.

Any pointers?

# dpkg -l | grep evolution
ii  evolution                                         3.28.5-0ubuntu0.18.04.1                      amd64        groupware suite with mail client and organizer
ii  evolution-common                                  3.28.5-0ubuntu0.18.04.1                      all          architecture independent files for Evolution
ii  evolution-data-server                             3.28.5-0ubuntu0.18.04.1                      amd64        evolution database backend server
ii  evolution-data-server-common                      3.28.5-0ubuntu0.18.04.1                      all          architecture independent files for Evolution Data Server
ii  evolution-plugin-bogofilter                       3.28.5-0ubuntu0.18.04.1                      amd64        standard plugins for Evolution (bogofilter)
ii  evolution-plugin-pstimport                        3.28.5-0ubuntu0.18.04.1                      amd64        standard plugins for Evolution (pstimport)
ii  evolution-plugins                                 3.28.5-0ubuntu0.18.04.1                      amd64        standard plugins for Evolution
ii  libebackend-1.2-10:amd64                          3.28.5-0ubuntu0.18.04.1                      amd64        Utility library for evolution data servers
ii  libebook-1.2-19:amd64                             3.28.5-0ubuntu0.18.04.1                      amd64        Client library for evolution address books
ii  libebook-contacts-1.2-2:amd64                     3.28.5-0ubuntu0.18.04.1                      amd64        Client library for evolution contacts books
ii  libecal-1.2-19:amd64                              3.28.5-0ubuntu0.18.04.1                      amd64        Client library for evolution calendars
ii  libedata-book-1.2-25:amd64                        3.28.5-0ubuntu0.18.04.1                      amd64        Backend library for evolution address books
ii  libedata-cal-1.2-28:amd64                         3.28.5-0ubuntu0.18.04.1                      amd64        Backend library for evolution calendars
ii  libedataserver-1.2-23:amd64                       3.28.5-0ubuntu0.18.04.1                      amd64        Utility library for evolution data servers
ii  libedataserverui-1.2-2:amd64                      3.28.5-0ubuntu0.18.04.1                      amd64        Utility library for evolution data servers
ii  libevolution                                      3.28.5-0ubuntu0.18.04.1                      amd64        evolution libraries

Thanks.

--
Len Philpot
lphilpot01 gmail com
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