[SOLVED] Upgrade from 5.1 - dpkg fails

[Giblet535]

I upgraded from 5.1, which upgrades Ubuntu to 18.04LTS.

dpkg fails with:

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...
fetchmail: no mailservers have been specified.
...
This causes all of the Zentyal mail packages to fail to configure. The upgrade is stuck at around 98% completion...

I don't use any fetches from other mail servers, and probably never will, so of course no mailservers are configured!

How can I get around this?

[Giblet535]

I set up a temporary /etc/fetchmailrc to poll the Zentyal server.

That allowed

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dpkg --configure fetchmailto succeed, so the the remainder of the upgrade can continue.