Comment 5 for bug 1457356

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Otto Kekäläinen (otto) wrote : Re: package mariadb-server-5.5 5.5.41-1ubuntu0.14.04.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1

> A yes/no dialog appeared during the upgrade with a message
> that it wanted to convert something. But I thougt it is a minor change
> and I did not want it, so I pressed no.

What did that dialog exactly say? It is very relevant what is said and what was your reponse to it was. Such a dialog is not visible in the automatic Apport logs.

What if you try 'sudo apt-get remove "mariadb-*"' and then reinstall?