Possibly this is related:
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes#MySQL_5.7
My belief is that ubuntu-release-upgrader can't handle this kind of
issue in a specific application. One way might be some kind of
maintainer script in the mysql-5.7 package.
** Also affects: mysql-5.7 (Ubuntu)
Importance: Undecided
Status: New
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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
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