Thank you for taking the time to report this bug and helping to make
Ubuntu better.
It look like an exim4 maintainer script experienced a failure on release
upgrade from Xenial to Bionic following a local configuration
customisation in the Xenial timeframe that Bionic's exim4 does not
understand,
Further investigation showed error was due to deprecated TLS options in
settings files.
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https://bugs.launchpad.net/bugs/1793932
Title:
Error on upgrade to LTS version of server
To man
