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apache2.pre-upgrade now links to apache2.pre-install. It's not something we want to do for all packages in master (edge). apache2 already had .pre-upgrade script (ensuring www-data group existence and making apache user a member of it), which is what existing .pre-install script also does, so this kind of unification is fine here. In most other cases linking .pre-upgrade to .pre-install should happen only in 3.4-stable branch.
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