The Linux Mint team has been working on a substantial upgrade to the Software Manager, which makes it load much quicker and boosts the security by disabling unverified Flatpaks by default.
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The Fedora Project has made Fedora 34 beta available for download. This version comes with GNOME 40, PipeWire, and transparent compression in BTRFS which will extend the life of SSDs.
The creator and lead developer of Flatpak has announced that he's got the packaging format working on Windows 10's WSL. The development is still in the early stages and requires workarounds.