If you’re running elementary OS 6 (Odin) and get a “Failed to download sources: module … server certificate verification failed. CAfile: none CRLfile: none“ error while trying to build a flatpak package that downloads from download.gnome.org, make sure you update your system (`sudo apt update && sudo apt upgrade` or use AppCenter and Update All) so it has the latest CA certificates.
(This is because of the Let’s Encrypt root CA changeover.)
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