When Ubuntu 25.04 made Papers its default PDF viewer rather than keep shipping Evince, it did so knowing that the expectation was that upstream GNOME

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GNOME 49 Alpha will replace Evince with Papers as the default PDF viewer, making Papers a Core App. Ubuntu 25.04 already adopted Papers as its default PDF viewer. The new Papers app features GTK4/libadwaita design, improved annotation editing, better accessibility support, and enhanced fractional scaling. While printing functionality remains problematic across GTK4 apps, Papers represents a modern replacement with active development including Rust integration and usability improvements.

GNOME 49 Makes Papers a Core App, Replacing Evince