Hi!

The page about the brilliant editor Kate - https://kde.org/applications/en/utilities/org.kde.kate - contains a green button - "Install on Linux".
This button does not work on Ubuntu.
Below it is this text: "This button only works with Discover and other AppStream application stores."
The word Discover is a link to https://kde.org/applications/system/org.kde.discover - but that page does not exist...

All in all I would have saved some precious time, if the page just contained the Terminal instructions for installing Kate under Ubuntu:

sudo apt update
sudo apt install kate

Good catch, the discover application doesn't have a website. I will try to fix that