Same problem on Yakkety. Birdfont app installed with g-s, "Remove" button not shown until "pkill gnome-software". Then I can see birdfont in the "Installed" page, launch the application and remove it.
Same problem on Yakkety.
Birdfont app installed with g-s, "Remove" button not shown until "pkill gnome-software". Then I can see birdfont in the "Installed" page, launch the application and remove it.