Discover doesn't support apt:// URLs, so you can't open various 1-click install thingies available in various corners of the web. For example, apt://arc-theme, available at http://www.omgubuntu.co.uk/2017/11/best-gtk-themes-for-ubuntu
Git commit f16f6f016117ce0f2e71a2c7c9c8c5f87b8bb0bb by Aleix Pol. Committed on 28/12/2017 at 16:15. Pushed by apol into branch 'master'. Support apt://pkgname uri scheme M +8 -0 discover/CMakeLists.txt M +1 -0 discover/DiscoverMainWindow.h M +2 -0 discover/main.cpp M +5 -0 discover/qml/DiscoverWindow.qml https://commits.kde.org/discover/f16f6f016117ce0f2e71a2c7c9c8c5f87b8bb0bb
*** Bug 389656 has been marked as a duplicate of this bug. ***