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Upgrading old Drupal, Part 1: No content shown, unable to login, missing modules, and resolve it.

I was upgrading an old drupal 6 multi-site to drupal 7. The main (default) site has been upgraded for years, all other sub-sites had been disabled or moved out before the migration.
But I recently want to re-enable a long-ignored old sub-site, which takes me a while. I got no content shown, unable to login, missing modules.

And This is How To Resolve Them.

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