Comment 8 for bug 996916

Thank you information about PostgreSQL told me to uninstall all packages depending on PostgreSQL and pgsql as well. This allowed me to start install process. Is it impossible to add information to possible causes " PostgreSQL packages installation may block upgrade"
Then there will be not such problems as my duplication of this bug as of bug 1310239.

Another recommedation is to add button for list of installed unsupported packages or button - uninstall unsported packages (my hurt some of your programs until package reinstall)