This has been fixed upstream since 2.1.21rc1.
bionic ships 2.1.26. I am closing this one.
** Changed in: mailman (Ubuntu)
Status: Confirmed => Fix Released
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Setting the task for a whishlist item, since it is essentially a config
change that breaks it (as Mark said 'shot oneself in the foot'.
I'm personally not so keen about on-upgrade detection+warning since that (in
general) has a history of too many false-positives leading people to
config-break t
I just ran into this problem following an upgrade from 12.04 LTS to
16.04 LTS. recode_list fixed the problem (thank you, Mark!) but this
seems like something Ubuntu should detect and offer to correct during
the upgrade.
** Also affects: mailman (Ubuntu)
Importance: Undecided
Status: New
