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, and on declining (or accepting the default or by non-
interaction) to update the conffile during upgrade. Is this accurate?
I understand how this can be a problem. I don't think it should break
the upgrade like this. Unfortunately it's an instance of the general
class of problem for which we don't currently have a good solution. I've
heard some developers say that the upgrade is correctly failing because
exim4 can't continue and not failing would be falsely suggesting that
the upgrade was successful when it was not (specifically that exim4
failed to upgrade and is no longer running).
Since there is a workaround - to update your configuration customisation
to fit the latest exim4 and restart the upgrade ("apt -f install, etc) -
I'm marking this bug as Medium. I'm also not sure that there's any clear
consensus on what to do about it, unfortunately, so please don't expect
any movement soon.
** Summary changed:
- Error on upgrade to LTS version of server
+ Deprecated conffile change causes release upgrade failure
** Changed in: exim4 (Ubuntu)
Status: New => Triaged
** Changed in: exim4 (Ubuntu)
Importance: Undecided => Medium
** Tags added: conffile release-upgrade triage
** Tags added: maintainer-script-failure
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https://bugs.launchpad.net/bugs/1793932
Title:
Deprecated conffile change causes release upgrade failure
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