Don't fail the build if the APT lists don't include any package whose name matches ^geoclue.
The build of my first tentative 3.9~rc1 ISO failed with: E: Unable to locate package ^geoclue* E: Couldn't find any package by glob '^geoclue*' E: Couldn't find any package by regex '^geoclue*' E: config/chroot_local-hooks/98-remove_unwanted_packages failed (exit non-zero). You should check for errors. That's because the partial, tagged APT snapshot used to build this ISO don't include any package whose name matches ^geoclue. So let's only attempt to remove such packages if at least one of them is installed.
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