What does “Repair system” [attempt to] do?

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After I attempt to update:

  1. 636×356 33.3 KB

    To cite it:

    Failed to load primary cache for repo “fedora” from “/var/cache/PackageKit/43/metadata/fedora-fe4b228be7d3c150/solv/fedora.solv”: read error while reading strings

  2. 1276×356 43.2 KB

    Why is this “Unknown”?

  3. Why is this so thin?

…it consistently fails, via plasma-discover-6.6.4-1.fc43:

  1. 332×265 31.9 KB

    It states:

    Failed to update 0 packages

    Failed to download metadata (metalink: “https://mirrors.fedoraproject.org/metalink?repo=updates-released-debug-f44&arch=x86_64”) for repository “updates-debuginfo”: Cannot prepare internal mirrorlist: Curl error (6): Could not resolve hostname for https://mirrors.fedoraproject.org/metalink?repo=updates-released-debug-f44&arch=x86_64 [Could not resolve host: mirrors.fedoraproject.org]

What does this attempt to do?

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