Since plasma lf packages does not provide all elements like icons, plasma themes, plasma applets etc, installing plasma lf package may result in a broken desktop if required packages are not present in the system . Reproducible: Always Steps to Reproduce: 1. Download Papirus look and feel package (system settings> look and feel> get new looks) 2. Select it Actual Results: Missing icons in dolphin and other apps Expected Results: In the case where required icons are not installed, Plasma should fall back to breeze icons.
Can reproduce it with arc-kde package Plasma: 5.12.1 Apps: 17.12.2 Frameworks: 5.43.0 Qt: 5.10.0 Kernel: 4.14.19-1-MANJARO OS: Netrunner Rolling
*** Bug 396941 has been marked as a duplicate of this bug. ***
Well that makes sense: it'll be setting the system to use a theme that doesn't exist. This is a bug in the global theme that does such a silly thing; please report it to them.