Ubuntu Flavors Will Stop Using Flatpak
https://www.omgubuntu.co.uk/2023/02/ubuntu-flavors-no-flatpak
Flatpak will no longer feature in the default install of Ubuntu's 8 official flavors, with devs agreeing to only support deb and snap software OOTB.
In a surprise move, Ubuntu developers have agreed to stop shipping Flatpak, preinstalled Flatpak apps, and any plugins needed to install Flatpak apps through a GUI software tool in the default package set across all eight of Ubuntu’s official flavors, as of the upcoming Ubuntu 23.04 release.