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The installation of Percona 5.6 alongside MySQL 5.7 may occur if the user has added Percona repositories to their system and then attempted to install both MySQL and Percona at the same time without specifying which version to install. This can lead to conflicts and unexpected behavior.

It is recommended to only install one version of a database at a time, unless specifically needed for testing or development purposes. If multiple versions are required, they should be installed in separate environments or on separate machines.