Workaround for "Executing Dolphin as root is not possible" issue
Tested on Fedora KDE 27/28 64bit
Tested on Ubuntu KDE 18 64bit
Note: After system updates (where dolphin/kate have been updated) binaries are need to be replaced again.
Find preinstalled binaries location:
find / -name "./libkdeinit5_dolphin.so"
Overwrite preinstalled Dolphin binaries
cp ./libkdeinit5_dolphin.so /usr/lib64/ #Fedora
cp ./libkdeinit5_dolphin.so /usr/lib/x86_64-linux-gnu/ #Kubuntu
Overwrite Kate binary
cp ./kate /usr/bin/