[debian-mysql] Bug#857444: Bug#857444: Bug#857444: mysql-server-5.5: upgrade from jessie to stretch leaves mysql server uninstalled

[Gabriel Filion]

Hi there,

I've traced inter-package links (depends, conflicts et al) and I think I
found the reason why the server gets removed.

stretch still has a mysql-common package that has a "Replaces:" for
mysql-server-5.5.

during a dist-upgrade mysql-common will get upgraded to the stretch
version, which in turn will remove the server package.

to test this hypothesis, I ran "apt-mark hold mysql-common" right before
doing a dist-upgrade from jessie to stretch and both mysql-server and
mysql-server-5.5 then don't get removed by apt/dpkg.

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