I tried again. This time journalctl -xe throws this useful error:
mysqld[23361]: mysqld: Can't read dir of '/etc/mysql/conf.d/' (Errcode: 2 - No 
such file or directory)

Easy fix now:
sudo cp -r /etc/mysql/mysql.conf.d/ /etc/mysql/conf.d/

Successfully migrated databases to 5.7

Repairing tables
mysql.proxies_priv                                 OK
Upgrade process completed successfully.
Checking if update is needed.
Setting up mysql-server (5.7.12-0ubuntu1) ...

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https://bugs.launchpad.net/bugs/1562362

Title:
  package mysql-server-5.7 (not installed) failed to install/upgrade:
  подпроцесс установлен сценарий post-installation возвратил код ошибки
  1

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