Since Antora 3.0, the build script now report any internal dead links. And we have a lot of them.

https://darknao.fedorapeople.org/build.log

Guide on how to fix it:

[19:47:33.715] ERROR (asciidoctor): target of xref not found: After_Installation.adoc#sect-gnome-initial-setup
    file: modules/install-guide/pages/install/After_Installation.adoc
    source: https://pagure.io/fedora-docs/install-guide.git (refname: master)

• Go to the specified repository: https://pagure.io/fedora-docs/install-guide.git
• Find the specified file in the master branch (refname) : https://pagure.io/fedora-docs/install-guide/blob/master/f/modules/install-guide/pages/install/After_Installation.adoc
• Find the line where the xref is defined. Sometime, the page includes other pages using the keyword include:

include::{partialsdir}/install/InitialSetupHub.adoc[]

In this example, the bad link can be found in this file: https://pagure.io/fedora-docs/install-guide/blob/master/f/modules/install-guide/pages/_partials/install/InitialSetupHub.adoc#_11

• Fix the link. Refer to Antora documentation about xref
  In this case, the correct link syntax is:

xref:install/After_Installation.adoc#sect-gnome-initial-setup[GNOME Initial Setup]

• Use the local preview to check your fix.
• Create a PR with your changes.