First of all I confirm that /usr/bin/mysql_plugin is owned:

Note: the "main" mysql in Trusty still is the 5.5 based 5.5.62-0ubuntu0.14.04.1
But that also has the file owned by mysql-client
Trusty: mysql-client-5.6 5.6.33-0ubuntu0.14.04.1
Trusty: mysql-client-5.5 5.5.62-0ubuntu0.14.04.1
Xenial: mysql-server-5.7 5.7.24-0ubuntu0.16.04.1

The new 5.7 has a breaks on its older server package, but not the older client 
package to guarantee update ordering.
  Breaks: mysql-server-5.6 (<< 5.7)

The actual move of the file is actually released in:
5.6.25-2 those got picked up by Xenial in 
https://launchpad.net/ubuntu/+source/mysql-5.6/5.6.28-1 and later.

I upgraded from Trusty 5.5 and 5.6 to Xenial 5.7 in two containers and
didn't run into these issues, but that might be by accident as there is
no guarantee on the ordering due to the lack of a breaks.

Maybe Rbasak has deeper insight into something I might overlook here, so
I subscribe him for his opinion on this.

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https://bugs.launchpad.net/bugs/1809486

Title:
  mysql-server-5.7 overwrites a file from mysql-client-5.6

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