[Bug 1725222] Re: do-release-upgrade from Ubuntu 14.04 to 16.04.1 performs unsupported upgrade from MySQL 5.5 to 5.7

[Marco Marsala]

Such maintainer script should perform the upgrade as recommended by
MySQL developers, so stepping one version a time; so, upgrading for
example, from Ubuntu 14 to 16, it should upgrade MySQL 5.5 to 5.6, then
5.6 to 5.7.

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https://bugs.launchpad.net/bugs/1725222

Title:
  do-release-upgrade from Ubuntu 14.04 to 16.04.1 performs unsupported
  upgrade from MySQL 5.5 to 5.7

Status in Ubuntu Server Guide:
  Invalid
Status in mysql-5.7 package in Ubuntu:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Updating from Ubuntu 14.04 to Ubuntu 16.04.1 using do-release-upgrade
  will cause troubles because MySQL is upgraded from 5.5 to 5.7, that is
  an unsupported update path, as per MySQL official documentation.

  Your script should do these pre-checks and prevent upgrade, or
  automatically solve the issue before applying upgrade.

  PS: the solution is to upgrade MySQL in two steps, first from 5.5 to
  5.6 then from 5.6 to 5.7.

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