The 'Available updates' page no longer has a section for Themes. I only have two sections now, Drupal core, and Modules.

The page's message still says this:

"Here you can find information about available updates for your installed modules and themes [...]"

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Status: Active » Closed (outdated)

Automatically closed because Drupal 6 is no longer supported. If the issue verifiably applies to later versions, please reopen with details and update the version.